7,874 results on '"Schreurs, A"'
Search Results
2. Multitone PSK Modulation Design for Simultaneous Wireless Information and Power Transfer
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Dhull, Prerna, Member, Graduate Student, Schreurs, Dominique, Paolini, Giacomo, Costanzo, Alessandra, Abolhasan, Mehran, and Shariati, Negin
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Electrical Engineering and Systems Science - Systems and Control - Abstract
Far-field wireless power transfer, based on radio frequency (RF) waves, came into the picture to fulfill the power need of large Internet of Things (IoT) networks, the backbone of the 5G and beyond era. However, RF communication signals carry both information as well as energy. Therefore, recently, simultaneous wireless information and power transfer (SWIPT) has attracted much attention in order to wirelessly charge these IoT devices. In this paper, we propose a novel N -tone multitone phase shift keying (PSK) modulation scheme, taking advantage of the non-linearity of integrated receiver rectifier architecture. The main advantage of the proposed modulation scheme is the reduction in ripple voltage, introduced by the symbol transmission through phases. Achievable power conversion efficiency (PCE) and bit error rate (BER) at the output are considered to measure the efficacy of the proposed modulation scheme. Simulation results are verified by the measurements over the designed rectifier circuitry. The effect of symbol phase range, modulation order, and the number of tones are analyzed. In the future, this transmission scheme can be utilized to satisfy the data and power requirements of low-power Internet of Things sensor networks.
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- 2024
3. Highly Sensitive Differential Microwave Sensor for Soil Moisture Measurement
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Keshavarz, Rasool, Lipman, Justin, Schreurs, Dominique, and Shariati, Negin
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Physics - Instrumentation and Detectors - Abstract
This paper presents a highly sensitive differential soil moisture sensor (DSMS) using a microstrip line loaded with triangular two turn resonator(T2 SR) and complementary of the rectangular two turn spiral resonator(CR2 SR),simultaneously.Volumetric Water Content (VWC) or permittivity sensing is conducted by loading the T2 SR side with dielectric samples.Two transmission notches are observed for identical loads relating to T2 SR and CR2 SR.The CR2 SR notch at 4.39 GHz is used as a reference for differential permittivity measurement method.Further, the resonance frequency of T2 SR is measured relative to the reference value. Based on this frequency difference,the permittivity of soil is calculated which is related to the soil VWC.Triangular two turn resonator (T2 SR) resonance frequency changes from 4 to 2.38 GHz when VWC varies 0 percent to 30 percent.The sensor's operation principle is described through circuit model analysis and simulations.To validate the differential sensing concept, prototype of the designed 3 cell DSMS is fabricated and measured.The proposed sensor exhibits frequency shift of 110 MHz for 1 percent change at the highest soil moisture content (30 percent) for sandy type soil.This work proves the differential microwave sensing concept for precision agriculture.
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- 2024
4. A study of centaur (54598) Bienor from multiple stellar occultations and rotational light curves
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Rizos, J. L., Fernández-Valenzuela, E., Ortiz, J. L., Rommel, F. L., Sicardy, B., Morales, N., Santos-Sanz, P., Leiva, R., Vara-Lubiano, M., Morales, R., Kretlow, M., Alvarez-Candal, A., Holler, B. J., Duffard, R., Gómez-Limón, J. M., Desmars, J., Souami, D., Assafin, M., Benedetti-Rossi, G., Braga-Ribas, F., Camargo, J. I. B., Colas, F., Lecacheux, J., Gomes-Júnior, A. R., Vieira-Martins, R., Pereira, C. L., Morgado, B., Kilic, Y., Redfield, S., Soloff, C., McGregor, K., Green, K., Midavaine, T., Schreurs, O., Lecossois, M., Boninsegna, R., Ida, M., Cam, P. Le, Isobe, K., Watanabe, Hayato, Yuasa, S., Watanabe, Hikaru, and Kidd, S.
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Astrophysics - Earth and Planetary Astrophysics - Abstract
Centaurs, distinguished by their volatile-rich compositions, play a pivotal role in understanding the formation and evolution of the early solar system, as they represent remnants of the primordial material that populated the outer regions. Stellar occultations offer a means to investigate their physical properties, including shape, rotational state, or the potential presence of satellites and rings. This work aims to conduct a detailed study of the centaur (54598) Bienor through stellar occultations and rotational light curves from photometric data collected during recent years. We successfully predicted three stellar occultations by Bienor, which were observed from Japan, Eastern Europe, and the USA. In addition, we organized observational campaigns from Spain to obtain rotational light curves. At the same time, we develop software to generate synthetic light curves from three-dimensional shape models, enabling us to validate the outcomes through computer simulations. We resolve Bienor's projected ellipse for December 26, 2022, determine a prograde sense of rotation, and confirm an asymmetric rotational light curve. We also retrieve the axes of its triaxial ellipsoid shape as a = (127 $\pm$ 5) km, b = (55 $\pm$ 4) km, and c = (45 $\pm$ 4) km. Moreover, we refine the rotation period to 9.1736 $\pm$ 0.0002 hours and determine a geometric albedo of (6.5 $\pm$ 0.5) %, higher than previously determined by other methods. Finally, by comparing our findings with previous results and simulated rotational light curves, we analyze whether an irregular or contact-binary shape, the presence of an additional element such as a satellite, or significant albedo variations on Bienor's surface, may be present.
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- 2024
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5. Proactive personality and mental well-being among the working population: testing a moderated mediation model
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Jawahar, I.M., Schreurs, Bert, and Abedini, Mahsa
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- 2024
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6. An open-source, three-dimensional growth model of the mandible
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Klop, Cornelis, Schreurs, Ruud, De Jong, Guido A, Klinkenberg, Edwin TM, Vespasiano, Valeria, Rood, Naomi L, Niehe, Valerie G, Soerdjbalie-Maikoe, Vidija, Van Goethem, Alexia, De Bakker, Bernadette S, Maal, Thomas JJ, Nolte, Jitske W, and Becking, Alfred G
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Quantitative Biology - Tissues and Organs - Abstract
The available reference data for the mandible and mandibular growth consists primarily of two-dimensional linear or angular measurements. The aim of this study was to create the first open-source, three-dimensional statistical shape model of the mandible that spans the complete growth period. Computed tomography scans of 678 mandibles from children and young adults between 0 and 22 years old were included in the model. The mandibles were segmented using a semi-automatic or automatic (artificial intelligence-based) segmentation method. Point correspondence among the samples was achieved by rigid registration, followed by non-rigid registration of a symmetrical template onto each sample. The registration process was validated with adequate results. Principal component analysis was used to gain insight in the variation within the dataset and to investigate age-related changes and sexual dimorphism. The presented growth model is accessible globally and free-of-charge for scientists, physicians and forensic investigators for any kind of purpose deemed suitable. The versatility of the model opens up new possibilities in the fields of oral and maxillofacial surgery, forensic sciences or biological anthropology. In clinical settings, the model may aid diagnostic decision-making, treatment planning and treatment evaluation.
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- 2023
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7. Integration of Artificial Vision and Image Processing into a Pick and Place Collaborative Robotic System
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Santos, Adriano A., Schreurs, Cas, da Silva, António Ferreira, Pereira, Filipe, Felgueiras, Carlos, Lopes, António M., and Machado, José
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- 2024
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8. Author Correction: Combination of proton- or X-irradiation with anti-PDL1 immunotherapy in two murine oral cancers
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Rykkelid, Anne Marit, Sinha, Priyanshu Manojkumar, Folefac, Charlemagne Asonganyi, Horsman, Michael R., Sørensen, Brita Singers, Søland, Tine Merete, Schreurs, Olaf Joseph Franciscus, Malinen, Eirik, and Edin, Nina Frederike J.
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- 2024
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9. Combination of proton- or X-irradiation with anti-PDL1 immunotherapy in two murine oral cancers
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Rykkelid, Anne Marit, Sinha, Priyanshu Manojkumar, Folefac, Charlemagne Asonganyi, Horsman, Michael R., Sørensen, Brita Singers, Søland, Tine Merete, Schreurs, Olaf Joseph Franciscus, Malinen, Eirik, and Edin, Nina Frederike J.
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- 2024
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10. A multifunctional smart field-programmable radio frequency surface
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Li, Tianzhi, Yu, Yang, Liu, Yutong, Unnithan, Ranjith R., McDermott, Ryan J., Schreurs, Dominique, Evans, Robin, and Skafidas, Efstratios
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- 2024
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11. Autophagy-enhancing ATG16L1 polymorphism is associated with improved clinical outcome and T-cell immunity in chronic HIV-1 infection
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Schreurs, Renée R. C. E., Koulis, Athanasios, Booiman, Thijs, Boeser-Nunnink, Brigitte, Cloherty, Alexandra P. M., Rader, Anusca G., Patel, Kharishma S., Kootstra, Neeltje A., and Ribeiro, Carla M. S.
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- 2024
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12. Predicting and improving complex beer flavor through machine learning
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Schreurs, Michiel, Piampongsant, Supinya, Roncoroni, Miguel, Cool, Lloyd, Herrera-Malaver, Beatriz, Vanderaa, Christophe, Theßeling, Florian A., Kreft, Łukasz, Botzki, Alexander, Malcorps, Philippe, Daenen, Luk, Wenseleers, Tom, and Verstrepen, Kevin J.
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- 2024
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13. Fully automated landmarking and facial segmentation on 3D photographs
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Berends, Bo, Bielevelt, Freek, Schreurs, Ruud, Vinayahalingam, Shankeeth, Maal, Thomas, and de Jong, Guido
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- 2024
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14. Interprofessional collaboration skills and motivation one year after an interprofessional educational intervention for undergraduate medical and nursing students
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Teuwen, Carolyn Joyce, Kusurkar, Rashmi A., Schreurs, Hermien, Daelmans, Hester E. M., and Peerdeman, Saskia M.
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- 2024
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15. Swedish and Dutch Pre-Service Teachers' Understandings of Equity and Preparedness to Promote Equity through Their Teaching
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Schreurs, Zoë and Chang Rundgren, Shu-Nu
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Equity is an important topic in school context globally because international migration is rapidly diversifying schools and classrooms across the world. Teacher quality is seen strongly related to student outcomes than demographic characteristics of students, and therefore important for achieving equity. This explorative study investigates the extent to which Swedish and Dutch pre-service teachers (PSTs) understand equity and are prepared to implement equity in their practice. Qualitative method was conducted in the study. Data from semi-structured interviews with 15 PSTs from Sweden and the Netherlands was thematically analysed to examine teacher knowledge about equity in education and related dispositions. The results showed that, while Swedish pre-service teachers had more theoretical knowledge in relation to teaching for equity, Dutch pre-service teachers had more practical knowledge and were therefore more prepared to implement equity in their lessons. The study recommends that teacher professional development for both in- and pre-service teachers needs to pay more attention to how equity is taught and how teachers embody equity principles in their practice.
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- 2023
16. Influence of lateral heterogeneities on strike-slip fault behaviour: insights from analogue models
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S. González-Muñoz, G. Schreurs, T. C. Schmid, and F. Martín-González
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Geology ,QE1-996.5 ,Stratigraphy ,QE640-699 - Abstract
This study investigates how lithological changes can affect the strike-slip fault propagation patterns using analogue models. Strike-slip fault zones are long structures that may cut across pre-existing tectonic or lithological steep boundaries. How strike-slip faulting is affected by a laterally heterogeneous upper crust is crucial for understanding the evolution of regional and local fault patterns, stress reorientations, and seismic hazard. Our models undergo sinistral distributed strike-slip shear (simple shear) and have been analysed by particle image velocimetry (PIV). We use quartz sand and microbeads as brittle analogue materials over a viscous mixture to distribute the deformation through the model. The first models investigate strike-slip faulting in a homogeneous upper crust using quartz sand or microbeads only. Three further models examine how the presence of a central section which laterally differs in its properties influences strike-slip faulting. The main observations are the following: The homogeneous upper crust shows typical Mohr–Coulomb strike-slip faults, with synthetic fault strikes related to the angle of internal friction of the material used. The heterogeneous upper crust has a profound effect on synthetic fault propagation, interaction, and linkage, as well as the kinematic evolution of antithetic faults that rotate around a vertical axis. The orientation of the central section determines whether antithetic fault activity concentrates along the entire length of the central contact or not. In the first case, fault activity is segmented or the number of different faults formed is increased in distinct domains. In the second case, the properties of the central material determine fault propagation, interaction, and/or linkage across the central domain. These findings have potential implications for nature that have been seen in the NW Iberian Peninsula. In this area, the change in direction of the sinistral faults and the position of the antithetic faults can be explained due to lithological change.
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- 2024
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17. Scaling slowly rotating asteroids by stellar occultations
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Marciniak, A., Ďurech, J., Choukroun, A., Hanuš, J., Ogłoza, W., Szakáts, R., Molnár, L., Pál, A., Monteiro, F., Frappa, E., Beisker, W., Pavlov, H., Moore, J., Adomavičienė, R., Aikawa, R., Andersson, S., Antonini, P., Argentin, Y., Asai, A., Assoignon, P., Barton, J., Baruffetti, P., Bath, K. L., Behrend, R., Benedyktowicz, L., Bernasconi, L., Biguet, G., Billiani, M., Błażewicz, D., Boninsegna, R., Borkowski, M., Bosch, J., Brazill, S., Bronikowska, M., Bruno, A., Bąk, M. Butkiewicz, Caron, J., Casalnuovo, G., Castellani, J. J., Ceravolo, P., Conjat, M., Delincak, P., Delpau, J., Demeautis, C., Demirkol, A., Dróżdż, M., Duffard, R., Durandet, C., Eisfeldt, D., Evangelista, M., Fauvaud, S., Fauvaud, M., Ferrais, M., Filipek, M., Fini, P., Fukui, K., Gährken, B., Geier, S., George, T., Goffin, B., Golonka, J., Goto, T., Grice, J., Guhl, K., Halíř, K., Hanna, W., Harman, M., Hashimoto, A., Hasubick, W., Higgins, D., Higuchi, M., Hirose, T., Hirsch, R., Hofschulz, O., Horaguchi, T., Horbowicz, J., Ida, M., Ignácz, B., Ishida, M., Isobe, K., Jehin, E., Joachimczyk, B., Jones, A., Juan, J., Kamiński, K., Kamińska, M. K., Kankiewicz, P., Kasebe, H., Kattentidt, B., Kim, D. -H., Kim, M. -J., Kitazaki, K., Klotz, A., Komraus, M., Konstanciak, I., Tóth, R. Könyves, Kouno, K., Kowald, E., Krajewski, J., Krannich, G., Kreutzer, A., Kryszczyńska, A., Kubánek, J., Kudak, V., Kugel, F., Kukita, R., Kulczak, P., Lazzaro, D., Licandro, J., Livet, F., Maley, P., Manago, N., Mánek, J., Manna, A., Matsushita, H., Meister, S., Mesquita, W., Messner, S., Michelet, J., Michimani, J., Mieczkowska, I., Morales, N., Motyliński, M., Murawiecka, M., Newman, J., Nikitin, V., Nishimura, M., Oey, J., Oszkiewicz, D., Owada, M., Pakštienė, E., Pawłowski, M., Pereira, W., Perig, V., Perła, J., Pilcher, F., Podlewska-Gaca, E., Polák, J., Polakis, T., Polińska, M., Popowicz, A., Richard, F., Rives, J. J., Rodrigues, T., Rogiński, Ł., Rondón, E., Rottenborn, M., Schäfer, R., Schnabel, C., Schreurs, O., Selva, A., Simon, M., Skiff, B., Skrutskie, M., Skrzypek, J., Sobkowiak, K., Sonbas, E., Sposetti, S., Stuart, P., Szyszka, K., Terakubo, K., Thomas, W., Trela, P., Uchiyama, S., Urbanik, M., Vaudescal, G., Venable, R., Watanabe, Ha., Watanabe, Hi., Winiarski, M., Wróblewski, R., Yamamura, H., Yamashita, M., Yoshihara, H., Zawilski, M., Zelený, P., Żejmo, M., Żukowski, K., and Żywica, S.
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Astrophysics - Earth and Planetary Astrophysics - Abstract
As evidenced by recent survey results, majority of asteroids are slow rotators (P>12 h), but lack spin and shape models due to selection bias. This bias is skewing our overall understanding of the spins, shapes, and sizes of asteroids, as well as of their other properties. Also, diameter determinations for large (>60km) and medium-sized asteroids (between 30 and 60 km) often vary by over 30% for multiple reasons. Our long-term project is focused on a few tens of slow rotators with periods of up to 60 hours. We aim to obtain their full light curves and reconstruct their spins and shapes. We also precisely scale the models, typically with an accuracy of a few percent. We used wide sets of dense light curves for spin and shape reconstructions via light-curve inversion. Precisely scaling them with thermal data was not possible here because of poor infrared data: large bodies are too bright for WISE mission. Therefore, we recently launched a campaign among stellar occultation observers, to scale these models and to verify the shape solutions, often allowing us to break the mirror pole ambiguity. The presented scheme resulted in shape models for 16 slow rotators, most of them for the first time. Fitting them to stellar occultations resolved previous inconsistencies in size determinations. For around half of the targets, this fitting also allowed us to identify a clearly preferred pole solution, thus removing the ambiguity inherent to light-curve inversion. We also address the influence of the uncertainty of the shape models on the derived diameters. Overall, our project has already provided reliable models for around 50 slow rotators. Such well-determined and scaled asteroid shapes will, e.g. constitute a solid basis for density determinations when coupled with mass information. Spin and shape models continue to fill the gaps caused by various biases., Comment: Accepted to Astronomy & Astrophysics. 12 pages + appendices
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- 2023
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18. Fully automated landmarking and facial segmentation on 3D photographs
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Berends, Bo, Bielevelt, Freek, Schreurs, Ruud, Vinayahalingam, Shankeeth, Maal, Thomas, and de Jong, Guido
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Computer Science - Computer Vision and Pattern Recognition ,Computer Science - Artificial Intelligence - Abstract
Three-dimensional facial stereophotogrammetry provides a detailed representation of craniofacial soft tissue without the use of ionizing radiation. While manual annotation of landmarks serves as the current gold standard for cephalometric analysis, it is a time-consuming process and is prone to human error. The aim in this study was to develop and evaluate an automated cephalometric annotation method using a deep learning-based approach. Ten landmarks were manually annotated on 2897 3D facial photographs by a single observer. The automated landmarking workflow involved two successive DiffusionNet models and additional algorithms for facial segmentation. The dataset was randomly divided into a training and test dataset. The training dataset was used to train the deep learning networks, whereas the test dataset was used to evaluate the performance of the automated workflow. The precision of the workflow was evaluated by calculating the Euclidean distances between the automated and manual landmarks and compared to the intra-observer and inter-observer variability of manual annotation and the semi-automated landmarking method. The workflow was successful in 98.6% of all test cases. The deep learning-based landmarking method achieved precise and consistent landmark annotation. The mean precision of 1.69 (+/-1.15) mm was comparable to the inter-observer variability (1.31 +/-0.91 mm) of manual annotation. The Euclidean distance between the automated and manual landmarks was within 2 mm in 69%. Automated landmark annotation on 3D photographs was achieved with the DiffusionNet-based approach. The proposed method allows quantitative analysis of large datasets and may be used in diagnosis, follow-up, and virtual surgical planning., Comment: 13 pages, 4 figures, 7 tables, repository https://github.com/rumc3dlab/3dlandmarkdetection/
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- 2023
19. Constraints on (2060) Chiron's size, shape, and surrounding material from the November 2018 and September 2019 stellar occultations
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Braga-Ribas, Felipe, Pereira, C. L., Sicardy, B., Ortiz, J. L., Desmars, J., Sickafoose, A., Emilio, M., Morgado, B., Margoti, G., Rommel, F. L., Camargo, J. I. B., Assafin, M., Vieira-Martins, R., Gomes-Júnior, A. R., Santos-Sanz, P., Morales, N., Kretlow, M., Lecacheux, J., Colas, F., Boninsegna, R., Schreurs, O., Dauvergne, J. L., Fernandez, E., van Heerden, H. J., González, H., Bihel, D., and Jankowsky, F.
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Astrophysics - Earth and Planetary Astrophysics - Abstract
After the discovery of rings around the largest known Centaur object, (10199) Chariklo, we carried out observation campaigns of stellar occultations produced by the second-largest known Centaur object, (2060) Chiron, to better characterize its physical properties and presence of material on its surroundings. We predicted and successfully observed two stellar occultations by Chiron. These observations were used to constrain its size and shape by fitting elliptical limbs with equivalent surface radii in agreement with radiometric measurements. Constraints on the (2060) Chiron shape are reported for the first time. Assuming an equivalent radius of R$_{equiv}$ = 105$^{+6}_{-7}$ km, we obtained a semi-major axis of a = 126 $\pm$ 22 km. Considering Chiron's true rotational light curve amplitude and assuming it has a Jacobi equilibrium shape, we were able to derive a 3D shape with a semi-axis of a = 126 $\pm$ 22 km, b = 109 $\pm$ 19 km, and c = 68 $\pm$ 13 km, implying in a volume-equivalent radius of R$_{vol}$ = 98 $\pm$ 17 km, implying a density of 1119 $\pm$ 4 kg m$^{-3}$. We determined the physical properties of the 2011 secondary events around Chiron, which may then be directly compared with those of Chariklo rings, as the same method was used. Data obtained from SAAO in 2018 do not show unambiguous evidence of the proposed rings, mainly due to the large sampling time. Meanwhile, we discarded the possible presence of a permanent ring similar to (10199) Chariklo's C1R in optical depth and extension. Using the first multi-chord stellar occultation by (2060) Chiron and considering it to have a Jacobi equilibrium shape, we derived its 3D shape. New observations of a stellar occultation by (2060) Chiron are needed to further investigate the material's properties around Chiron, such as the occultation predicted for September 10, 2023.
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- 2023
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20. Simulated Microgravity Alters Gene Regulation Linked to Immunity and Cardiovascular Disease
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Tahimic, Candice GT, Steczina, Sonette, Sebastian, Aimy, Hum, Nicholas R, Abegaz, Metadel, Terada, Masahiro, Cimini, Maria, Goukassian, David A, Schreurs, Ann-Sofie, Hoban-Higgins, Tana M, Fuller, Charles A, Loots, Gabriela G, Globus, Ruth K, and Shirazi-Fard, Yasaman
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Biological Sciences ,Genetics ,Heart Disease ,Aging ,Cardiovascular ,2.1 Biological and endogenous factors ,Good Health and Well Being ,Animals ,Male ,Female ,Rats ,Weightlessness Simulation ,Rats ,Long-Evans ,Cardiovascular Diseases ,Oxidative Stress ,Gene Expression Regulation ,Hindlimb Suspension ,hindlimb unloading ,microgravity ,cardiovascular system ,immune response ,transcriptomics - Abstract
Microgravity exposure induces a cephalad fluid shift and an overall reduction in physical activity levels which can lead to cardiovascular deconditioning in the absence of countermeasures. Future spaceflight missions will expose crew to extended periods of microgravity among other stressors, the effects of which on cardiovascular health are not fully known. In this study, we determined cardiac responses to extended microgravity exposure using the rat hindlimb unloading (HU) model. We hypothesized that exposure to prolonged simulated microgravity and subsequent recovery would lead to increased oxidative damage and altered expression of genes involved in the oxidative response. To test this hypothesis, we examined hearts of male (three and nine months of age) and female (3 months of age) Long-Evans rats that underwent HU for various durations up to 90 days and reambulated up to 90 days post-HU. Results indicate sex-dependent changes in oxidative damage marker 8-hydroxydeoxyguanosine (8-OHdG) and antioxidant gene expression in left ventricular tissue. Three-month-old females displayed elevated 8-OHdG levels after 14 days of HU while age-matched males did not. In nine-month-old males, there were no differences in 8-OHdG levels between HU and normally loaded control males at any of the timepoints tested following HU. RNAseq analysis of left ventricular tissue from nine-month-old males after 14 days of HU revealed upregulation of pathways involved in pro-inflammatory signaling, immune cell activation and differential expression of genes associated with cardiovascular disease progression. Taken together, these findings provide a rationale for targeting antioxidant and immune pathways and that sex differences should be taken into account in the development of countermeasures to maintain cardiovascular health in space.
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- 2024
21. Optimizing Testing Feedback in Introductory Chemistry: A Multi-Treatment Study Exploring Varying Levels of Assessment Feedback and Subsequent Performance
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Kristen L. Murphy, David G. Schreurs, Melonie A. Teichert, Cynthia J. Luxford, Jaclyn M. Trate, Jordan T. Harshmann, and Jamie L. Schneider
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Providing students with feedback on their performance is a critical part of enhancing student learning in chemistry and is often integrated into homework assignments, quizzes, and exams. However, not all feedback is created equal, and the type of feedback the student receives can dramatically alter the utility of the feedback to reinforce correct processes and assist in correcting incorrect processes. This work seeks to establish a ranking of how eleven different types of testing feedback affected student retention or growth in performance on multiple-choice general chemistry questions. These feedback methods ranged from simple noncorrective feedback to more complex and engaging elaborative feedback. A test-retest model was used with a one-week gap between the initial test and following test in general chemistry I. Data collection took place at multiple institutions over multiple years. Data analysis used four distinct grading schemes to estimate student performance. These grading schemes included dichotomous scoring, two polytomous scoring techniques, and the use of item response theory to estimate students' true score. Data were modeled using hierarchical linear modeling which was set up to control for any differences in initial abilities and to determine the growth in performance associated with each treatment. Results indicated that when delayed elaborative feedback was paired with students being asked to recall/rework the problem, the largest student growth was observed. To dive deeper into student growth, both the differences in specific content-area improvement and the ability levels of students who improved the most were analyzed.
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- 2024
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22. Investigation into the Intersection between Response Process Validity and Answer-Until-Correct Validity: Development of the Repeated Attempt Processing Issue Detection (RAPID) Method
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David G. Schreurs, Jaclyn M. Trate, Shalini Srinivasan, Melonie A. Teichert, Cynthia J. Luxford, Jamie L. Schneider, and Kristen L. Murphy
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With the already widespread nature of multiple-choice assessments and the increasing popularity of answer-until-correct, it is important to have methods available for exploring the validity of these types of assessments as they are developed. This work analyzes a 20-question multiple choice assessment covering introductory undergraduate chemistry topics which was given to students in an answer-until-correct manner. Response process validity was investigated through one-on-one think-aloud interviews with undergraduate chemistry students. Answer-until-correct validity was also explored using an analysis of partial credit assignments. Results indicated the convenience of the quantitative partial credit method came at great cost to the precision of validity issue detection and is therefore not a valid shortcut to more rich qualitative approaches. The repeated attempt processing issue detection (RAPID) method is a novel method developed as a combination of response process and answer-until-correct validity. Results from this new method revealed validity issues that were undetected from the use of either approach individually or in concert.
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- 2024
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23. Association of the CHEK2 c.1100delC variant, radiotherapy, and systemic treatment with contralateral breast cancer risk and breast cancer‐specific survival
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Morra, Anna, Schreurs, Maartje AC, Andrulis, Irene L, Anton‐Culver, Hoda, Augustinsson, Annelie, Beckmann, Matthias W, Behrens, Sabine, Bojesen, Stig E, Bolla, Manjeet K, Brauch, Hiltrud, Broeks, Annegien, Buys, Saundra S, Camp, Nicola J, Castelao, Jose E, Cessna, Melissa H, Chang‐Claude, Jenny, Chung, Wendy K, Sahlberg, Kristine K, Børresen‐Dale, Anne‐Lise, Gram, Inger Torhild, Olsen, Karina Standahl, Engebråten, Olav, Naume, Bjørn, Geisler, Jürgen, OSBREAC, Alnæs, Grethe I Grenaker, Colonna, Sarah V, Couch, Fergus J, Cox, Angela, Cross, Simon S, Czene, Kamila, Daly, Mary B, Dennis, Joe, Devilee, Peter, Dörk, Thilo, Dunning, Alison M, Dwek, Miriam, Easton, Douglas F, Eccles, Diana M, Eriksson, Mikael, Evans, D Gareth, Fasching, Peter A, Fehm, Tanja N, Figueroa, Jonine D, Flyger, Henrik, Gabrielson, Marike, Gago‐Dominguez, Manuela, García‐Closas, Montserrat, García‐Sáenz, José A, Genkinger, Jeanine, Grassmann, Felix, Gündert, Melanie, Hahnen, Eric, Haiman, Christopher A, Hamann, Ute, Harrington, Patricia A, Hartikainen, Jaana M, Hoppe, Reiner, Hopper, John L, Houlston, Richard S, Howell, Anthony, Clarke, Christine, Marsh, Deborah, Scott, Rodney, Baxter, Robert, Yip, Desmond, Carpenter, Jane, Davis, Alison, Pathmanathan, Nirmala, Simpson, Peter, Graham, J Dinny, Sachchithananthan, Mythily, Amor, David, Andrews, Lesley, Antill, Yoland, Balleine, Rosemary, Beesley, Jonathan, Bennett, Ian, Bogwitz, Michael, Botes, Leon, Brennan, Meagan, Brown, Melissa, Buckley, Michael, Burke, Jo, Butow, Phyllis, Caldon, Liz, Campbell, Ian, Cao, Michelle, Chakrabarti, Anannya, Chauhan, Deepa, Chauhan, Manisha, Chenevix‐Trench, Georgia, Christian, Alice, Cohen, Paul, Colley, Alison, Crook, Ashley, Cui, James, Courtney, Eliza, Cummings, Margaret, and Dawson, Sarah‐Jane
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Biomedical and Clinical Sciences ,Oncology and Carcinogenesis ,Breast Cancer ,Cancer ,Clinical Research ,Prevention ,Women's Health ,Female ,Humans ,Breast Neoplasms ,Checkpoint Kinase 2 ,Genetic Predisposition to Disease ,Germ-Line Mutation ,Heterozygote ,Proportional Hazards Models ,CHEK2 c.1100delC germline genetic variant ,contralateral breast cancer risk ,radiotherapy ,survival ,systemic treatment ,NBCS Collaborators ,ABCTB Investigators ,kConFab Investigators ,Biochemistry and Cell Biology ,Oncology and carcinogenesis - Abstract
BackgroundBreast cancer (BC) patients with a germline CHEK2 c.1100delC variant have an increased risk of contralateral BC (CBC) and worse BC-specific survival (BCSS) compared to non-carriers.AimTo assessed the associations of CHEK2 c.1100delC, radiotherapy, and systemic treatment with CBC risk and BCSS.MethodsAnalyses were based on 82,701 women diagnosed with a first primary invasive BC including 963 CHEK2 c.1100delC carriers; median follow-up was 9.1 years. Differential associations with treatment by CHEK2 c.1100delC status were tested by including interaction terms in a multivariable Cox regression model. A multi-state model was used for further insight into the relation between CHEK2 c.1100delC status, treatment, CBC risk and death.ResultsThere was no evidence for differential associations of therapy with CBC risk by CHEK2 c.1100delC status. The strongest association with reduced CBC risk was observed for the combination of chemotherapy and endocrine therapy [HR (95% CI): 0.66 (0.55-0.78)]. No association was observed with radiotherapy. Results from the multi-state model showed shorter BCSS for CHEK2 c.1100delC carriers versus non-carriers also after accounting for CBC occurrence [HR (95% CI): 1.30 (1.09-1.56)].ConclusionSystemic therapy was associated with reduced CBC risk irrespective of CHEK2 c.1100delC status. Moreover, CHEK2 c.1100delC carriers had shorter BCSS, which appears not to be fully explained by their CBC risk.
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- 2023
24. Activated CD27+PD-1+ CD8 T Cells and CD4 T Regulatory Cells Dominate the Tumor Microenvironment in Refractory Celiac Disease Type II
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Tessa Dieckman, Mette Schreurs, Ciska Lindelauf, Ahmed Mahfouz, Caroline R. Meijer, Louise Pigeaud, Vincent van Unen, Gerd Bouma, and Frits Koning
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Coeliac ,Gluten enteropathy ,Enteropathy-associated T cell lymphoma ,Single-cell analysis ,Diseases of the digestive system. Gastroenterology ,RC799-869 - Abstract
Background and Aims: Refractory celiac disease type II (RCDII) is characterized by a clonally expanded aberrant cell population in the small intestine. The role of other tissue-resident immune subsets in RCDII is unknown. Here, we characterized CD8 and CD4 T cells in RCDII duodenum at the single-cell level and in situ. Methods: We applied mass cytometry on CD45+ duodenal cells derived from intestinal biopsies (n = 23) and blood samples (n = 20) from RCDII patients and controls. Additionally, we analyzed intestinal biopsies from celiac disease (n = 11) and RCDI (n = 2) patients. We performed single-cell RNA-sequencing on CD45+ duodenal cells derived from a RCDII patient, immunofluorescence staining for in situ analysis and flow cytometry for phenotyping of RCDII aberrant and CD8 T cells. Results: Compared to healthy controls, we observed that CD27+PD-1+ memory CD8αβ cells and CD4 T regulatories (Tregs) were more abundant in RCDII duodenum (CD8 ∗∗0.0029; CD4 ∗∗∗0.0001). The CD27+PD-1+ memory CD8αβ cells expressed the tissue-resident marker CD69, immunoregulatory markers (TIGIT, HAVCR2, TNFRSF9), NKG2A, were enriched for activated pathways and displayed cytotoxic gene signatures (NKG7, PRF1, GZMA). The absence of CD103 accords with their localization in the lamina propria as determined by in situ analysis. The CD25+FoxP3+CD27+CD127dim/- CD4 Tregs expressed IL1R2 and IL32 and costimulatory molecules (TNFSRS4, ICOS and TNFRSF18) and resided in the lamina propria as well. Flow cytometry confirmed the presence of the inhibitory receptor NKG2A on expanded duodenal CD8 T cells and HLA-E, the ligand for NKG2A, on expanded aberrant cells. Conclusion: RCDII is characterized by the simultaneous presence of an activated CD27+PD-1+ memory CD8αβ T cell subset and CD4 Tregs, suggesting that checkpoint blockade with anti-NKG2A/PD-1 and/or anticytotoxic T lymphocyte antigen 4 may be an attractive treatment option.
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- 2025
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25. Local therapy with combination TLR agonists stimulates systemic anti-tumor immunity and sensitizes tumors to immune checkpoint blockade
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Francois Xavier Rwandamuriye, Tao Wang, Hanfu Zhang, Omar Elaskalani, Jorren Kuster, Xueting Ye, Breana Vitali, Juliët Schreurs, M. Lizeth Orozco Morales, Marck Norret, Cameron W. Evans, Rachael M. Zemek, K. Swaminathan Iyer, W. Joost Lesterhuis, and Ben Wylie
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Cancer immunotherapy ,combination therapy ,hydrogel ,innate immunity ,surgery ,TLR agonists ,Immunologic diseases. Allergy ,RC581-607 ,Neoplasms. Tumors. Oncology. Including cancer and carcinogens ,RC254-282 - Abstract
Toll-like receptor (TLR) agonists are being developed as anti-cancer therapeutics due to their potent immunostimulatory properties. However, clinical trials testing TLR agonists as monotherapy have often failed to demonstrate significant improvement over standard of care. We hypothesized that the anti-cancer efficacy of TLR agonist immunotherapy could be improved by combinatorial approaches. To prevent increased toxicity, often seen with systemic combination therapies, we developed a hydrogel to deliver TLR agonist combinations at low doses, locally, during cancer debulking surgery. Using tumor models of WEHI 164 and bilateral M3–9-M sarcoma and CT26 colon carcinoma, we assessed the efficacy of pairwise combinations of poly(I:C), R848, and CpG in controlling local and distant tumor growth. We show that combination of the TLR3 agonist poly(I:C) and TLR7/8 agonist R848 drives anti-tumor immunity against local and distant tumors. In addition, combination of local poly(I:C) and R848 sensitized tumors to systemic immune checkpoint blockade, improving tumor control. Mechanistically, we demonstrate that local therapy with poly(I:C) and R848 recruits inflammatory monocytes to the tumor draining lymph nodes early in the anti-tumor response. Finally, we provide proof of concept for intraoperative delivery of poly(I:C) and R848 together via a surgically applicable biodegradable hydrogel.
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- 2024
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26. Exploring Adolescents’ Social Media Connection and Disconnection: A Latent Class Approach
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Lise-Marie Nassen, Kathrin Karsay, Laura Vandenbosch, and Lara Schreurs
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adolescents ,disconnection ,latent class analysis ,social media use ,voluntary disconnection ,Communication. Mass media ,P87-96 - Abstract
In industrialized societies characterized by ubiquitous connectivity, many individuals disconnect from their phones or social media to break patterns of habitual use, reduce information overload, alleviate stress, and avoid distractions. Although research has predominantly focused on (young) adults, information on digital disconnection among adolescents remains limited. In response, in the present study, we analyzed survey data from 956 Flemish adolescents in Belgium (Mage = 15.10, SD = 1.61, and 64.8% girls) and, using latent class analysis, identified two subgroups: Class 1 labeled as “low adoption of social media apps and disconnection tools,” and Class 2 labeled as “high adoption of social media apps and disconnection tools.” Adolescents in Class 2 were more likely to use social media, specifically social networking, instant messaging, and entertainment apps, and to adopt disconnection tools (e.g., iOS Screentime or the Forest app). Next, drawing on the media practice model, we investigated how sociodemographic and sociopsychological factors contribute to those usage patterns and found that girls, older adolescents, and adolescents with higher scores for depressive symptoms and flourishing were more likely to belong to Class 2. Those findings offer new insights into adolescents’ social media connection and disconnection that can inform interventions to promote healthier smartphone use among adolescents.
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- 2024
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27. Clinical prediction models for patients undergoing total hip arthroplasty: an external validation based on a systematic review and the Dutch Arthroplasty Register
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Maartje Belt, Katrijn Smulders, B Willem Schreurs, and Gerjon Hannink
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Arthroplasty ,External validation ,Hip ,Prediction model ,Orthopedic surgery ,RD701-811 - Abstract
Background and purpose: External validation is a crucial step after prediction model development. Despite increasing interest in prediction models, external validation is frequently overlooked. We aimed to evaluate whether joint registries can be utilized for external validation of prediction models, and whether published prediction models are valid for the Dutch population with a total hip arthroplasty. Methods: We identified prediction models developed in patients undergoing arthroplasty through a systematic literature search. Model variables were evaluated for availability in the Dutch Arthroplasty Registry (LROI). We assessed the model performance in terms of calibration and discrimination (area under the curve [AUC]). Furthermore, the models were updated and evaluated through intercept recalibration and logistic recalibration. Results: After assessing 54 papers, 19 were excluded for not describing a prediction model (n = 16) or focusing on non-TJA populations (n = 3), leaving 35 papers describing 44 prediction models. 90% (40/44) of the prediction models used outcomes or predictors missing in the LROI, such as diabetes, opioid use, and depression. 4 models could be externally validated on LROI data. The models’ discrimination ranged between poor and acceptable and was similar to that in the development cohort. The calibration of the models was insufficient. The model performance improved slightly after updating. Conclusion: External validation of the 4 models resulted in suboptimal predictive performance in the Dutch population, highlighting the importance of external validation studies.
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- 2024
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28. Combination of proton- or X-irradiation with anti-PDL1 immunotherapy in two murine oral cancers
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Anne Marit Rykkelid, Priyanshu Manojkumar Sinha, Charlemagne Asonganyi Folefac, Michael R. Horsman, Brita Singers Sørensen, Tine Merete Søland, Olaf Joseph Franciscus Schreurs, Eirik Malinen, and Nina Frederike J. Edin
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Medicine ,Science - Abstract
Abstract Combining radiation therapy with immunotherapy is a strategy to improve both treatments. The purpose of this study was to compare responses for two syngeneic head and neck cancer (HNC) tumor models in mice following X-ray or proton irradiation with or without immune checkpoint inhibition (ICI). MOC1 (immunogenic) and MOC2 (less immunogenic) tumors were inoculated in the right hind leg of each mouse (C57BL/6J, n = 398). Mice were injected with anti-PDL1 (10 mg/kg, twice weekly for 2 weeks), and tumors were treated with single-dose irradiation (5–30 Gy) with X-rays or protons. MOC2 tumors grew faster and were more radioresistant than MOC1 tumors, and all mice with MOC2 tumors developed metastases. Irradiation reduced the tumor volume in a dose-dependent manner. ICI alone reduced the tumor volume for MOC1 with 20% compared to controls, while no reduction was seen for MOC2. For MOC1, there was a clear treatment synergy when combining irradiation with ICI for radiation doses above 5 Gy and there was a tendency for X-rays being slightly more biologically effective compared to protons. For MOC2, there was a tendency of protons being more effective than X-rays, but both radiation types showed a small synergy when combined with ICI. Although the responses and magnitudes of the therapeutic effect varied, the optimal radiation dose for maximal synergy appeared to be in the order of 10–15 Gy, regardless of tumor model.
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- 2024
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29. A multifunctional smart field-programmable radio frequency surface
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Tianzhi Li, Yang Yu, Yutong Liu, Ranjith R. Unnithan, Ryan J. McDermott, Dominique Schreurs, Robin Evans, and Efstratios Skafidas
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Science - Abstract
Abstract Antennas that can operate across multiple communication standards have remained a challenge. To address these limitations, we propose a Field-Programmable Radio Frequency Surface (FPRFS), which is based on manipulating current flow on its surface to achieve desirable RF characteristics. In this work, we demonstrate that substantial enhancements in radiation efficiency can be achieved while preserving the high reconfigurability of antenna structures implemented on the FPRFS. This is accomplished by utilizing an asymmetric excitation, directing the excitation to the low-loss contiguous surface, and dynamically manipulating the imaged return current on a segmented ground plane by switches. This important insight allows for adaptable antenna performance that weakly depends on the number of RF switches or their loss. We experimentally validate that FPRFS antennas can achieve efficiencies comparable to traditionally implemented antenna counterparts. This permits the FPRFS to be effectively utilized as a productive antenna and impedance-matching network with real-time reconfigurability.
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- 2024
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30. Activated CD27+PD-1+ CD8 T Cells and CD4 T Regulatory Cells Dominate the Tumor Microenvironment in Refractory Celiac Disease Type II
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Dieckman, Tessa, Schreurs, Mette, Lindelauf, Ciska, Mahfouz, Ahmed, Meijer, Caroline R., Pigeaud, Louise, van Unen, Vincent, Bouma, Gerd, and Koning, Frits
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- 2025
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31. Optimised treatment of patients with enlarged lateral lymph nodes in rectal cancer: protocol of an international, multicentre, prospective registration study after extensive multidisciplinary training (LaNoReC)
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Susan Van Dieren, Joost Nederend, Pieter J Tanis, Roel Hompes, Klaas Havenga, Melissa W Taggart, Robert Riedl, Michail Doukas, Evert-Jan G. Boerma, Marinke Westerterp, Corrie A M Marijnen, Jaap Stoker, Andrew Ruszkiewicz, Tsuyoshi Konishi, Jarno Melenhorst, Karin Muller, Krista Gerbrands, Michael Croft, Michael Wilks, Johanne G. Bloemen, Peter A. Neijenhuis, Koen C.M.J. Peeters, Miranda Kusters, Martijn Intven, Jan Peringa, Maria Verseveld, Eline G M van Geffen, Tania C Sluckin, Sanne-Marije J A Hazen, Karin Horsthuis, Geerard Beets, Marilyne M Lange, Regina G H Beets-Tan, Marc R. W. Engelbrecht, Elisabeth D. Geijsen, Philip Meijnen, Jurriaan B. Tuynman, Ingrid M. Bruijnzeel, Bas Lamme, Femke M. Alberts, Rogier M. P. H. Crolla, Joanne Verdult, Johan H. Wijsman, Charlotte S. van Kessel, Erik Jan Mulder, Jan Binne Hulshoff, Ivan M. Cherepanin, Hans F. J. Fabry, G. Y. Mireille, Frank J. M. Kemper, Fatih Polat, Jacobus W. A. Burger, Jeltsje S. Cnossen, Shira H. de Bie, Robbert J. I. Bosker, Aaldert K. Talsma, Leonora S. F. Boogerd, Marc J. P. M. Govaert, Merel M. Scheurkogel, Imogeen E. Antonisse, Joost Rothbarth, Marianne de Vries, Marcel A. H. Ribbert, Anthony W. H. van de Ven, Susan ter Borg, Jennifer W. Bradshaw, Heleen M. Ceha, Fleur I. de Korte, Andreas W. K. S. Marinelli, Tjeerd S. Aukema, Liselotte W. van Bockel, Aukje A. J. M. van Tilborg, Tom Rozema, Amarins Brandsma, Stefan Hoogendoorn, Saskia R. Offerman, Hanneke Vos, Henderik L. van Westreenen, Jeroen W. A. Leijtens, Fabian A. Holman, Laura A. Velema, L Els, van Persijn van Meerten, Frans C. H. Bakers, Iryna Samarska, Nina Šefčovičová, Maaike Berbée, Bastiaan B. Pultrum, Dennis B. Rouw, Matthew Albert, L. René Arensman, Hanneke Basart, Esther C. J. Consten, Bart C.T. van de Laar, Inne Somers, Paul M. Verheijen, Thomas A. Fassaert, Christiaan Hoff, Eino B. van Duyn, Ellen M. Hendriksen, Hugo A.J. Gielkens, Arend G. J. Aalbers, Brechtje A. Grotenhuis, Michalda S. Dunker, Anne M. van Geel, Christof Meischl, W. Hermien Schreurs, Patty H. Spruit, Michael F. Gerhards, Thomas M. Karsten, Eveline J.T. Krul, Sebastiaan van Koeverden, Andre J. A. Bremers, Heidi Rütten, Johannes H. W. de Wilt, Mariska den Hartogh, Vera Oppedijk, Jan Willem T. Dekker, Debora Eschbach-Zandbergen, Daphne Roos, Arjan van Tilburg, Ernst Jan, Spillenaar Bilgen, Nikki Knijn, Marnix A. J. de Roos, Ilse van Dop, Tracy Fitzsimmons, Hidde M. Kroon, Michael Penniment, Mitchell Raeside, Tarik Sammour, Steven J. Oosterling, Jeroen A. W. Tielbeek, Ronald J. C. L. M. Vuylsteke, Erik J. R. J. van der Hoeven, Anke B. Smits, Anniek H. Boer, Edgar J. B. Furnée, Robbert J. de Haas, Manon N. G. J. A. Braat, Wilhelmina M. U. van Grevenstein, Milan C. Richir, Patricia J. A. M. Brouwers, Tilly Leseman, Eric H. J. Belgers, Jasenko Krdzalic, and Roy F. A. Vliegen
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Medicine - Abstract
Introduction Inadequate treatment of enlarged lateral lymph nodes (LLNs) in rectal cancer patients is associated with an increased lateral local recurrence (LLR) risk, despite neoadjuvant treatment and total mesorectal excision (TME) surgery. There is a promising role for LLN dissection (LLND) to lower this risk, but this challenging procedure requires appropriate training. This study protocol describes a prospective evaluation of oncological outcomes after standardised treatment based on multidisciplinary training, thereby aiming for a 50% reduction in LLR rate.Methods and analysis A prospective registration study will be opened in hospitals in which the involved multidisciplinary team members (radiologists, radiation oncologists, surgeons and pathologists) have received dedicated training to enhance knowledge and awareness of LLNs and in which standardised treatment including LLND has been implemented. Patients with rectal cancer and at least one enlarged LLN (short-axis ≥7.0 mm), or intermediate LLN (short-axis 5.0–6.9 mm) with at least one malignant feature on primary MRI, evaluated by a trained radiologist, are eligible. Patients will undergo neoadjuvant treatment by trained radiation oncologists, followed by TME surgery in combination with a minimally invasive, nerve-sparing LLND performed by trained surgeons. LLND specimens are evaluated by trained pathologists or grossing assistants. The primary outcome is LLR rate 3 years postoperatively. Secondary outcomes are morbidity, disease-free survival, overall survival and quality of life. To demonstrate a significant reduction in LLR rate from 13% (based on historical control data) to 6% after optimised treatment, 200 patients with enlarged LLNs are required.Ethics and dissemination The medical ethics board of the Vrije Universiteit Medical Centre (VUMC), the Netherlands, approved the study on 23 November 2022 (reference: 2021.0524). Participating centres must obtain local approval and participants are required to provide written informed consent. Results obtained from this study will be communicated via peer-reviewed medical journals and presentations at conferences.Trail registration number NCT04486131, 24 July 2020, https://clinicaltrials.gov/ct2/show/NCT04486131.
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- 2024
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32. Cohort profile: a nationwide study in Dutch CHEK2 c.1100delC families using the infrastructure of the HEreditary Breast and Ovarian cancer study Netherlands – Hebon-CHEK2
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Rosa de Groot, Antoinette Hollestelle, Klaartje van Engelen, Muriel A Adank, Marjanka K Schmidt, Marinus J Blok, Frans B L Hogervorst, Johan J P Gille, Lieke P V Berger, Marijke R Wevers, Maartje A.C. Schreurs, Denise J Stommel-Jenner, Christi J. Van Asperen, Margreet G.E.M. Ausems, Willemina Geurts-Giele, and Maartje J. Hooning
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Medicine - Abstract
Purpose CHEK2 c.1100delC is associated with an increased breast cancer risk in women. While this variant is prevalent in the Netherlands (1% in the general population), knowledge of aetiology and prognosis of breast cancer and other tumours in CHEK2 c.1100delC carriers is lacking. The nationwide HEreditary Breast and Ovarian cancer study the Netherlands (Hebon) cohort aims to answer study questions in families with an increased risk of breast cancer and ovarian cancer. While initially focusing on BRCA1/2-variant families, Hebon gradually expanded to include pathogenic variants in other genes associated with breast and/or ovarian cancer over time. This provides an excellent setting to establish a cohort to ultimately study the impact of CHEK2 c.1100delC on cancer risk prediction and surveillance, breast cancer treatment and prognosis.Participants We invited all heterozygous and homozygous CHEK2 c.1100delC indexes and tested female relatives. 1802 women were included, of whom 1374 were heterozygotes and 938 were breast cancer cases. Pedigrees were collected from all clinical genetic departments. Furthermore, participants completed a detailed questionnaire on hormonal and lifestyle factors, family history, cancer diagnosis and treatment.Findings to date Mean age at study inclusion was 53 years. Linkage with the Netherlands Cancer Registry showed a younger age at diagnosis in homozygotes (mean age 41.7 years) and heterozygotes (47.9 years) than non-carriers (51.2 years). Furthermore, carriers were more often diagnosed with grade 2, oestrogen receptor-positive breast cancer and more often developed contralateral breast cancer than non-carriers. Most women consumed alcohol regularly and about half never smoked.Future plans Further data linkages with the Netherlands Cancer Registry will allow prospective follow-up and breast cancer risk assessment in unaffected women at the time of genetic testing, risk of contralateral breast cancer and survival in patients with breast cancer. Also, linkage with the nationwide network and registry of histopathology and cytopathology in The Netherlands (PALGA) allows us to retrieve tumour samples to study tumourigenesis.
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- 2024
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33. Methotrexate treatment hampers induction of vaccine-specific CD4 T cell responses in patients with IMID
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Sander W Tas, Joep Killestein, Joost Raaphorst, Taco W Kuijpers, Alexandre E Voskuyl, Gertjan Wolbink, Theo Rispens, Anneke J van der Kooi, Anja Ten Brinke, Karina de Leeuw, Abraham Rutgers, Juan J Garcia-Vallejo, Frederike J Bemelman, YK Onno Teng, Phyllis I Spuls, Mark Löwenberg, Jelle de Wit, Diane van der Woude, Marcel W Bekkenk, Luuk Wieske, Esther Brusse, Laura Boekel, Filip Eftimov, Eileen W Stalman, Maurice Steenhuis, Sofie Keijzer, Olvi Cristianawati, Koos P J van Dam, Adriaan G Volkers, Annelie H Musters, Nicoline F Post, Angela L Bosma, Marc L Hilhorst, Yosta Vegting, Bo Broens, Barbara Horváth, Annabel M Ruiter, Matthias H Busch, Dirk Jan Hijnen, Niels J M Verstegen, Pieter A van Doorn, Jan JGM Verschuuren, Laura Y L Kummer, Ruth R Hagen, Christine Kreher, Lisan H Kuijper, Mariël C Duurland, Veronique A L Konijn, Carolien E van de Sandt, Laura Fernández Blanco, Amélie Bos, Charlotte Menage, Tineke Jorritsma, Jet van den Dijssel, Rivka de Jongh, Tom Ashhurst, Marit J van Gils, Mathieu Claireaux, Sija Marieke van Ham, Renée CF van Allaart, Adája E Baars, George Elias, Cécile ACM van Els, H Stephan Goedee, Geert RAM D’Haens, Papay BP Jallah, Elham S Mirfazeli, Jim BD Keijser, Lotte van Ouwerkerk, Pieter van Paassen, Agner R Parra Sanchez, W Ludo van der Pol, Corine RG Schreurs, R Bart Takkenberg, and Koos AH Zwinderman
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Medicine - Abstract
Objectives Methotrexate (MTX) is one of the most commonly used medications to treat rheumatoid arthritis (RA). However, the effect of MTX treatment on cellular immune responses remains incompletely understood. This raises concerns about the vulnerability of these patients to emerging infections and following vaccination.Methods In the current study, we investigated the impact of MTX treatment in patients with immune-mediated inflammatory disease on B and CD4 T cell SARS-CoV-2 vaccination responses. Eighteen patients with RA and two patients with psoriatic arthritis on MTX monotherapy were included, as well as 10 patients with RA without immunosuppressive treatment, and 29 healthy controls. CD4 T and B cell responses were analysed 7 days and 3–6 months after two SARS-CoV-2 messenger RNA vaccinations. High-dimensional flow cytometry analysis was used to analyse fresh whole blood, an activation-induced marker assay to measure antigen-specific CD4 T cells, and spike probes to study antigen-specific B cells.Results Seven days following two SARS-CoV-2 vaccinations, total B and T cell counts were similar between MTX-treated patients and controls. In addition, spike-specific B cell frequencies were unaffected. Remarkably, the frequency of antigen-specific CD4 T cells was reduced in patients using MTX and correlated strongly with anti-RBD IgG antibodies. These results suggest that decreased CD4 T cell activity may result in slower vaccination antibody responses in MTX-treated patients.Conclusion Taken together, MTX treatment reduces vaccine-induced CD4 T cell activation, which correlates with lower antibody responses.Trial registration number NL8900.
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- 2024
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34. Geriatric interprofessional education for enhancing students’ interest in treating older people [version 2; peer review: 1 approved, 2 approved with reservations]
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Hermien Schreurs, Rashmi A. Kusurkar, Saskia M. Peerdeman, Hester E.M. Daelmans, Karlijn Vorstermans, and Carolyn Joyce Teuwen
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Interprofessional education ,attitudes ,older patients ,nursing students ,medical students ,controlled intervention study ,eng ,Special aspects of education ,LC8-6691 ,Medicine - Abstract
Interprofessional education is one of the interventions used to increase health care students’ motivation for working with older patients. Previous research about such interventions has been conducted without the use of control groups and has given inconclusive results. The objective of the present curricular resource was: Does geriatric paper-based interprofessional education influence students’ interest in treating older people? During a one-year period, undergraduate fourth-year medical and third-year nursing students wrote four health care plans for four different paper-based older patient cases. In the intervention group students were paired up in interprofessional couples. In the control group students made the assignment alone. Interest for working with older patients was measured on a 5-point Likert scale before and one year after the intervention. In both groups, no significant change was found. Before-interest score of the interprofessional group was relatively high (3.8) so the non-significant results may be due to a ceiling effect. Nursing students’ interest in treating older people at the start of the research was higher than medical students’ interest.
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- 2024
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35. The Differences in Content of Health Care Plans of Medical and Nursing Students in Interprofessional and Uniprofessional Education
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Carolyn Teuwen, Hanke Scheffer, Suheda Sekmen-Algin, Rashmi A. Kusurkar, Hermien Schreurs, Hester Daelmans, and Saskia Peerdeman
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Special aspects of education ,LC8-6691 ,Medicine (General) ,R5-920 - Abstract
Background With a growing population of older people in all Western countries, interprofessional education (IPE) can help to prepare students for the complex care for these patients. Which aspects of this complex care could benefit from IPE? In this study we evaluated the differences in content of health care plans made by students who participated in IPE. Methods Undergraduate nursing and medical students were included and attended four sessions in which they wrote a health care plan for a paper-based geriatric patient case. Approximately half of the students were included in the IPE-group. To evaluate the content of interprofessional collaboration between the students, the other half of the students were included in a ‘uniprofessional education’ (UPE) group. UPE-students made the health care plan alone. In the IPE-group a medical and a nursing students compiled the health care plan together. All health care plans were assessed by comparing them with a validated health care plan. We zoomed into the differences in the content of the health care plans, and calculated a score ratio, proportion of correct items. Results The health care plans made by IPE-students had an average score ratio of 0.31. The health care plans made by UPE-students had an average score ratio of 0.22. Most differences were found in the subcategories medication, nursing actions and aftercare. Specific items within these categories were more frequently thought of in the IPE-group than in the UPE-group, for example delirium interventions and consultation with a transfer nurse. Conclusion This study gives insights into which health care actions are more often considered by interprofessional couples in IPE than by students in UPE. Awareness of these items in clinical practice could make a difference in the care for older patients.
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- 2024
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36. A gluten-free diet for endometriosis patients lacks evidence to recommend it
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Annelotte P. van Haaps, MD, Fred Brouns, MD, Anneke M.F. Schreurs, MD, PhD, Daniel Keszthelyi, MD PhD, Jacques W.M. Maas, MD, PhD, and Velja Mijatovic, MD, PhD
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dietary intervention ,endometriosis ,endometriosis diet ,fiber deficiency ,gastrointestinal symptom ,gluten-free diet ,Gynecology and obstetrics ,RG1-991 - Abstract
Endometriosis is an estrogen-dependent chronic disease characterized by the presence of endometriumlike tissue outside the uterus and is often associated with symptoms, such as dysmenorrhea, dysuria, dyschezia, chronic pelvic pain, and infertility. Moreover, women diagnosed with endometriosis can report gastrointestinal symptoms, including bloating, constipation or diarrhea, and abdominal cramping, which can be associated with irritable bowel syndrome and can result in the misdiagnosis of endometriosis as irritable bowel syndrome at first. Treatment usually involves hormonal therapy, pain management, surgery, and/or assisted reproductive techniques in case of infertility. Nonetheless, these treatment methods can be insufficient for alleviating symptoms or can have unacceptable side effects, leading to noncompliance. Therefore, women often apply self-management strategies, including dietary interventions.One of the diets frequently suggested as a tool to manage endometriosis-related symptoms on social media and patient forums is a gluten-free diet. Although a gluten-free diet has been proven effective in managing nonceliac wheat sensitivity or celiac disease, its effectiveness in endometriosis remains uncertain. The Nurses’ Health Study II found it unlikely that gluten intake was a strong factor in endometriosis etiology and symptomatology. To the best of our knowledge, the most frequently cited and sole published intervention study on the efficacy of a gluten-free diet for endometriosis has several important limiting factors, including the absence of a control group. In addition, gluten consumption is highly susceptible to a placebo effect and a nocebo effect, where women might experience symptom relief after eliminating gluten and return of symptoms after they consume gluten again, solely because they believe that gluten is bad for them. Despite the inverse association between body mass index and endometriosis and between a gluten-free diet and increased body mass index, this is an association, and no causality was proven. In addition, other factors should be taken into consideration.Of note, a gluten-free diet is expensive, has limited availability, and has a significant effect on quality of life. Moreover, without proper dietary guidance, it may adversely affect the gastrointestinal microbiome. Therefore, scientifically substantiated advice regarding the use of a gluten-free diet for endometriosis-related symptoms is currently not available, and a gluten-free diet should be discouraged unless there is an additional diagnosis of nonceliac wheat sensitivity or celiac disease.
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- 2024
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37. Living well with chronic pain: a 12-month randomized controlled trial revealing impact from the digital pain self-management program EPIO
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Lise Solberg Nes, Elin Børøsund, Cecilie Varsi, Hilde Eide, Lori B. Waxenberg, Karen E. Weiss, Eleshia J. Morrison, Hanne Stavenes Støle, Ólöf B. Kristjansdottir, Katrine Bostrøm, Elin Bolle Strand, Milada Cvancarova Småstuen Hagen, Audun Stubhaug, and Karlein M.G. Schreurs
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Anesthesiology ,RD78.3-87.3 - Abstract
Abstract. Introduction:. Chronic pain affects a wide range of physical and psychological aspects of life for those impacted. Psychosocial treatment approaches may be of support, but outreach is still limited. Objectives:. To evaluate the efficacy of EPIO, an evidence-informed, user-centered digital self-management intervention for people with chronic pain, in a 12-month randomized controlled trial. Methods:. People living with chronic pain (N = 266) were randomized to the EPIO intervention (n = 132) or a usual-care control group (n = 134). The intervention was delivered in a simple blended care model, and outcome measures collected at baseline, 6 months, and 12 months. Generalized linear models for repeated measures were fitted to compare groups over time. Results:. Participants were primarily female (81%), median age 49 years (range 22–78), with heterogeneous pain conditions, and had lived with pain >5 years (77.6%). A mixed linear model with all timepoints included revealed no statistically significant group differences for the primary outcome of pain interference. Significant psychological benefits in favor of the intervention group were however detected for depression (P = 0.022), self-regulatory fatigue (P = 0.024), vitality (P = 0.016), and mental health (P = 0.047). Baseline to 12-month changes showed additional favorable effects for anxiety (between-group mean differences [MDs] = 0.79, P = 0.047), depression (MD = 1.08, P = 0.004), self-regulatory fatigue (MD = 2.42, P = 0.021), pain catastrophizing (MD = 2.62, P = 0.009), and health-related quality of life. Conclusions:. The EPIO program aims to improve outreach of evidence-based pain self-management interventions. Findings demonstrate how using EPIO can lead to sustainable psychological change, enhancing mental health and health-related quality of life for people suffering from pain, providing a chance to live well with the pain.
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- 2024
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38. Predicting and improving complex beer flavor through machine learning
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Michiel Schreurs, Supinya Piampongsant, Miguel Roncoroni, Lloyd Cool, Beatriz Herrera-Malaver, Christophe Vanderaa, Florian A. Theßeling, Łukasz Kreft, Alexander Botzki, Philippe Malcorps, Luk Daenen, Tom Wenseleers, and Kevin J. Verstrepen
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Science - Abstract
Abstract The perception and appreciation of food flavor depends on many interacting chemical compounds and external factors, and therefore proves challenging to understand and predict. Here, we combine extensive chemical and sensory analyses of 250 different beers to train machine learning models that allow predicting flavor and consumer appreciation. For each beer, we measure over 200 chemical properties, perform quantitative descriptive sensory analysis with a trained tasting panel and map data from over 180,000 consumer reviews to train 10 different machine learning models. The best-performing algorithm, Gradient Boosting, yields models that significantly outperform predictions based on conventional statistics and accurately predict complex food features and consumer appreciation from chemical profiles. Model dissection allows identifying specific and unexpected compounds as drivers of beer flavor and appreciation. Adding these compounds results in variants of commercial alcoholic and non-alcoholic beers with improved consumer appreciation. Together, our study reveals how big data and machine learning uncover complex links between food chemistry, flavor and consumer perception, and lays the foundation to develop novel, tailored foods with superior flavors.
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- 2024
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39. Autophagy-enhancing ATG16L1 polymorphism is associated with improved clinical outcome and T-cell immunity in chronic HIV-1 infection
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Renée R. C. E. Schreurs, Athanasios Koulis, Thijs Booiman, Brigitte Boeser-Nunnink, Alexandra P. M. Cloherty, Anusca G. Rader, Kharishma S. Patel, Neeltje A. Kootstra, and Carla M. S. Ribeiro
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Science - Abstract
Abstract Chronic HIV-1 infection is characterized by T-cell dysregulation that is partly restored by antiretroviral therapy. Autophagy is a critical regulator of T-cell function. Here, we demonstrate a protective role for autophagy in HIV-1 disease pathogenesis. Targeted analysis of genetic variation in core autophagy gene ATG16L1 reveals the previously unidentified rs6861 polymorphism, which correlates functionally with enhanced autophagy and clinically with improved survival of untreated HIV-1-infected individuals. T-cells carrying ATG16L1 rs6861(TT) genotype display improved antiviral immunity, evidenced by increased proliferation, revamped immune responsiveness, and suppressed exhaustion/immunosenescence features. In-depth flow-cytometric and transcriptional profiling reveal T-helper-cell-signatures unique to rs6861(TT) individuals with enriched regulation of pro-inflammatory networks and skewing towards immunoregulatory phenotype. Therapeutic enhancement of autophagy recapitulates the rs6861(TT)-associated T-cell traits in non-carriers. These data underscore the in vivo relevance of autophagy for longer-lasting T-cell-mediated HIV-1 control, with implications towards development of host-directed antivirals targeting autophagy to restore immune function in chronic HIV-1 infection.
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- 2024
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40. Fully automated landmarking and facial segmentation on 3D photographs
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Bo Berends, Freek Bielevelt, Ruud Schreurs, Shankeeth Vinayahalingam, Thomas Maal, and Guido de Jong
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Deep learning ,DiffusionNet ,Cephalometry ,Landmarks ,3D photogrammetry ,3D meshes ,Medicine ,Science - Abstract
Abstract Three-dimensional facial stereophotogrammetry provides a detailed representation of craniofacial soft tissue without the use of ionizing radiation. While manual annotation of landmarks serves as the current gold standard for cephalometric analysis, it is a time-consuming process and is prone to human error. The aim in this study was to develop and evaluate an automated cephalometric annotation method using a deep learning-based approach. Ten landmarks were manually annotated on 2897 3D facial photographs. The automated landmarking workflow involved two successive DiffusionNet models. The dataset was randomly divided into a training and test dataset. The precision of the workflow was evaluated by calculating the Euclidean distances between the automated and manual landmarks and compared to the intra-observer and inter-observer variability of manual annotation and a semi-automated landmarking method. The workflow was successful in 98.6% of all test cases. The deep learning-based landmarking method achieved precise and consistent landmark annotation. The mean precision of 1.69 ± 1.15 mm was comparable to the inter-observer variability (1.31 ± 0.91 mm) of manual annotation. Automated landmark annotation on 3D photographs was achieved with the DiffusionNet-based approach. The proposed method allows quantitative analysis of large datasets and may be used in diagnosis, follow-up, and virtual surgical planning.
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- 2024
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41. Interprofessional collaboration skills and motivation one year after an interprofessional educational intervention for undergraduate medical and nursing students
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Carolyn Joyce Teuwen, Rashmi A. Kusurkar, Hermien Schreurs, Hester E. M. Daelmans, and Saskia M. Peerdeman
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Interprofessional education ,Interprofessional collaboration ,Long-term effect ,Motivation ,Self-determination theory ,Undergraduate medical students ,Special aspects of education ,LC8-6691 ,Medicine - Abstract
Abstract Background The increasingly complex patient care in the twenty-first century is delivered by interprofessional health care teams. Interprofessional collaboration can be taught during interprofessional education. However, whether a long-term change in collaborative competencies can be achieved by interprofessional education has not been studied sufficiently. Our research questions were: How does motivation for interprofessional collaboration and interprofessional collaborative skills change up to one year after an interprofessional educational intervention? How are they related to each other? Methods During a one-year period, undergraduate medical and nursing students attended four interprofessional (intervention) or uniprofessional (control group) education sessions. Self-determination Theory was used as the theoretical framework. Autonomous and controlled motivation scores for interprofessional collaboration were calculated using the Academic Self-Regulation Questionnaire, before (T1), directly after (T2) and one year post-intervention (T3). At T3, the students also filled out the Interprofessional Collaborative Competencies Attainment Survey (ICCAS), which measured the perceived attainment of collaborative competencies by a retrospective pre-test/post-test design. We used linear mixed effects models to analyse the motivation scores and linear regression for the relation between motivation and competence. Results In the interprofessional group, autonomous motivation scores of the participants were significantly lower at T2 vs. T1. Controlled motivation scores were significantly higher at T3 vs. T1. Controlled motivation scores for T2 were significantly higher in the uniprofessional group than in the interprofessional group. Perceived competence was related to higher autonomous motivation scores. At T3 the interprofessional collaborative competencies seemed to have grown more among students in the interprofessional group. Conclusions The perceived growth in interprofessional collaboration competence lasted at least up to one year after the intervention, and was measurable with the ICCAS. The growth was significantly more in the IPE students than in the UPE students. The few differences found in motivation scores for interprofessional collaboration were probably caused by an imbalance of nursing versus medical students over the different time points. This finding indicates that classroom based IPE can contribute to interprofessional collaboration skills of nursing and medical students at least up to one year after an intervention.
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- 2024
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42. L2Explorer: A Lifelong Reinforcement Learning Assessment Environment
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Johnson, Erik C., Nguyen, Eric Q., Schreurs, Blake, Ewulum, Chigozie S., Ashcraft, Chace, Fendley, Neil M., Baker, Megan M., New, Alexander, and Vallabha, Gautam K.
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Computer Science - Machine Learning ,Computer Science - Artificial Intelligence - Abstract
Despite groundbreaking progress in reinforcement learning for robotics, gameplay, and other complex domains, major challenges remain in applying reinforcement learning to the evolving, open-world problems often found in critical application spaces. Reinforcement learning solutions tend to generalize poorly when exposed to new tasks outside of the data distribution they are trained on, prompting an interest in continual learning algorithms. In tandem with research on continual learning algorithms, there is a need for challenge environments, carefully designed experiments, and metrics to assess research progress. We address the latter need by introducing a framework for continual reinforcement-learning development and assessment using Lifelong Learning Explorer (L2Explorer), a new, Unity-based, first-person 3D exploration environment that can be continuously reconfigured to generate a range of tasks and task variants structured into complex and evolving evaluation curricula. In contrast to procedurally generated worlds with randomized components, we have developed a systematic approach to defining curricula in response to controlled changes with accompanying metrics to assess transfer, performance recovery, and data efficiency. Taken together, the L2Explorer environment and evaluation approach provides a framework for developing future evaluation methodologies in open-world settings and rigorously evaluating approaches to lifelong learning., Comment: 10 Pages submitted to AAAI AI for Open Worlds Symposium 2022
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- 2022
43. A gluten-free diet for endometriosis patients lacks evidence to recommend it
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van Haaps, Annelotte P., Brouns, Fred, Schreurs, Anneke M.F., Keszthelyi, Daniel, Maas, Jacques W.M., and Mijatovic, Velja
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- 2024
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44. Time trends in case-mix and risk of revision following hip and knee arthroplasty in public and private hospitals: a cross-sectional analysis based on 476,312 procedures from the Dutch Arthroplasty Register
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Bart-Jan van Dooren, Pelle Bos, Rinne M Peters, Liza N van Steenbergen, Enrico De Visser, J Martijn Brinkman, B Willem Schreurs, and Wierd P Zijlstra
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Arthroplasty ,Hip ,Independent treatment center ,Knee ,Private ,Public ,Orthopedic surgery ,RD701-811 - Abstract
Background and purpose: This study aims to assess time trends in case-mix and to evaluate the risk of revision and causes following primary THA, TKA, and UKA in private and public hospitals in the Netherlands. Methods: We retrospectively analyzed 476,312 primary arthroplasties (public: n = 413,560 and private n = 62,752) implanted between 2014 and 2023 using Dutch Arthroplasty Register data. We explored patient demographics, procedure details, trends over time, and revisions per hospital type. Adjusted revision risk was calculated for comparable subgroups (ASA I/II, age ≤ 75, BMI ≤ 30, osteoarthritis diagnosis, and moderate–high socioeconomic status (SES). Results: The volume of THAs and TKAs in private hospitals increased from 4% and 9% in 2014, to 18% and 21% in 2022. Patients in private hospitals were younger, had lower ASA classification, lower BMI, and higher SES compared with public hospital patients. In private hospitals, age and ASA II proportion increased over time. Multivariable Cox regression demonstrated a lower revision risk for primary THA (HR 0.7, CI 0.7–0.8), TKA (HR 0.8, CI 0.7–0.9), and UKA (HR 0.8, CI 0.7–0.9) in private hospitals. After initial arthroplasty in private hospitals, 49% of THA and 37% of TKA revisions were performed in public hospitals. Conclusion: Patients in private hospitals were younger, had lower ASA classification, lower BMI, and higher SES compared with public hospital patients. The number of arthroplasties increased in private hospitals, with a lower revision risk compared with public hospitals.
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- 2024
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45. Erratum to ‘The benefit of adding polygenic risk scores, lifestyle factors, and breast density to family history and genetic status for breast cancer risk and surveillance classification of unaffected women from germline CHEK2 c.1100delC families’ [The Breast 73 (2024) 103611]
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Maartje A.C. Schreurs, Teresa Ramón y Cajal, Muriel A. Adank, J. Margriet Collée, Antoinette Hollestelle, Jeroen van Rooij, Marjanka K. Schmidt, and Maartje J. Hooning
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Neoplasms. Tumors. Oncology. Including cancer and carcinogens ,RC254-282 - Published
- 2024
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46. The benefit of adding polygenic risk scores, lifestyle factors, and breast density to family history and genetic status for breast cancer risk and surveillance classification of unaffected women from germline CHEK2 c.1100delC families
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Maartje A.C. Schreurs, Teresa Ramón y Cajal, Muriel A. Adank, J. Margriet Collée, Antoinette Hollestelle, Jeroen van Rooij, Marjanka K. Schmidt, and Maartje J. Hooning
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CHEK2 c.1100delC ,Breast cancer ,Risk prediction ,Neoplasms. Tumors. Oncology. Including cancer and carcinogens ,RC254-282 - Abstract
To determine the changes in surveillance category by adding a polygenic risk score based on 311 breast cancer (BC)-associated variants (PRS311), questionnaire-based risk factors and breast density on personalized BC risk in unaffected women from Dutch CHEK2 c.1100delC families.In total, 117 unaffected women (58 heterozygotes and 59 non-carriers) from CHEK2 families were included. Blood-derived DNA samples were genotyped with the GSAMDv3-array to determine PRS311. Lifetime BC risk was calculated in CanRisk, which uses data from the Breast and Ovarian Analysis of Disease Incidence and Carrier Estimation Algorithm (BOADICEA). Women, were categorized into three surveillance groups.The surveillance advice was reclassified in 20 (34.5%) heterozygotes and 21 (35.6%) non-carriers after adding PRS311. Including questionnaire-based risk factors resulted in an additional change in 11 (20.0%) heterozygotes and 8 (15.1%) non-carriers; and a sub-analysis showed that adding breast density on top shifted another 9 (23.1%) heterozygotes and 5 (27.8%) non-carriers. Overall, the majority of heterozygotes were reclassified to a less intensive surveillance, while non-carriers would require intensified surveillance.The addition of PRS311, questionnaire-based risk factors and breast density to family history resulted in a more personalized BC surveillance advice in CHEK2-families, which may lead to more efficient use of surveillance.
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- 2024
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47. Protocol for delivery of intraoperative immunotherapy to mice by surgical debulking of subcutaneous tumors
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Francois Xavier Rwandamuriye, Breana Vitali, Juliët Schreurs, Tao Wang, Emily Barrick, Killugudi Swaminathan Iyer, Willem Joost Lesterhuis, Rachael M. Zemek, and Ben Wylie
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Cancer ,Immunology ,Model Organisms ,Science (General) ,Q1-390 - Abstract
Summary: Pre-clinical studies developing novel therapies to prevent cancer recurrence require appropriate surgical models. Here, we present a protocol for surgical debulking of subcutaneous tumors in mice, which allows for intraoperative application of immunotherapy-loaded biomaterials. We describe steps for inoculating tumor cells, anesthetizing mice, and performing surgery. We then detail procedures for applying biomaterial, bandaging mice, and data collection and analysis. The optimized bandaging regimen resolves the issue of wound dehiscence after surgery, for C57BL/6 mice, which interfere with surgical sites.For complete details on the use and execution of this protocol, please refer to Rwandamuriye et al.1 : Publisher’s note: Undertaking any experimental protocol requires adherence to local institutional guidelines for laboratory safety and ethics.
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- 2024
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48. Dengue virus exploits autophagy vesicles and secretory pathways to promote transmission by human dendritic cells
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Alexandra P. M. Cloherty, Anusca G. Rader, Kharishma S. Patel, Tracy-Jane T. H. D. Eisden, Sterre van Piggelen, Renée R. C. E. Schreurs, and Carla M. S. Ribeiro
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dengue virus ,autophagy ,extracellular vesicles ,dendritic cells ,secretory autophagy ,viral transmission ,Immunologic diseases. Allergy ,RC581-607 - Abstract
Dengue virus (DENV), transmitted by infected mosquitoes, is a major public health concern, with approximately half the world’s population at risk for infection. Recent decades have increasing incidence of dengue-associated disease alongside growing frequency of outbreaks. Although promising progress has been made in anti-DENV immunizations, post-infection treatment remains limited to non-specific supportive treatments. Development of antiviral therapeutics is thus required to limit DENV dissemination in humans and to help control the severity of outbreaks. Dendritic cells (DCs) are amongst the first cells to encounter DENV upon injection into the human skin mucosa, and thereafter promote systemic viral dissemination to additional human target cells. Autophagy is a vesicle trafficking pathway involving the formation of cytosolic autophagosomes, and recent reports have highlighted the extensive manipulation of autophagy by flaviviruses, including DENV, for viral replication. However, the temporal profiling and function of autophagy activity in DENV infection and transmission by human primary DCs remains poorly understood. Herein, we demonstrate that mechanisms of autophagosome formation and extracellular vesicle (EV) release have a pro-viral role in DC-mediated DENV transmission. We show that DENV exploits early-stage canonical autophagy to establish infection in primary human DCs. DENV replication enhanced autophagosome formation in primary human DCs, and intrinsically-heightened autophagosome biogenesis correlated with relatively higher rates of DC susceptibility to DENV. Furthermore, our data suggest that viral replication intermediates co-localize with autophagosomes, while productive DENV infection introduces a block at the late degradative stages of autophagy in infected DCs but not in uninfected bystander cells. Notably, we identify for the first time that approximately one-fourth of DC-derived CD9/CD81/CD63+ EVs co-express canonical autophagy marker LC3, and demonstrate that DC-derived EV populations are an alternative, cell-free mechanism by which DCs promote DENV transmission to additional target sites. Taken together, our study highlights intersections between autophagy and secretory pathways during viral infection, and puts forward autophagosome accumulation and viral RNA-laden EVs as host determinants of DC-mediated DENV infection in humans. Host-directed therapeutics targeting autophagy and exocytosis pathways thus have potential to enhance DC-driven resistance to DENV acquisition and thereby limit viral dissemination by initial human target cells following mosquito-to-human transmission of DENV.
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- 2024
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49. WiLO-OFDM Transmission Scheme for Simultaneous Wireless Information and Power Transfer
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Steven Claessens, Prerna Dhull, Dominique Schreurs, and Sofie Pollin
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Energy harvesting ,envelope detector ,Internet of Things (IoT) ,local oscillator ,OFDM ,receiver architecture ,Telecommunication ,TK5101-6720 ,Transportation and communications ,HE1-9990 - Abstract
Lowering the dependency of receivers and sensors on energy supplies is a requirement for a realistic Internet of Things. This is certainly achieved when sensor nodes are powered wirelessly. Local oscillators (LOs), required to receive and transmit modern radio frequency (RF) waveforms, consume a considerable amount of the power budget. We propose a Wireless Local Oscillator (WiLO) concept to move the LO from the sensor to an external location and transmit it wirelessly to the sensor. This WiLO is modeled as a constant tone transmission. As is well known, the sensor can backscatter the constant tone, which enables uplink transmission. Our system approach allows the downconversion of any RF waveform without LO and mixer while simultaneously utilizing the same signal for power transfer. In this work, we demonstrate our approach to different types of OFDM signals, which can be considered as a general complex RF signal example to be received. Our WiLO-based technique to receive any modern communication signal without LO, in combination with harvesting energy from the tone and backscattering on that tone, results in a promising energy-efficient IoT solution. We present the performance model with design requirements for WiLO tone and amplitudes of OFDM tones for feasible reception of WiLO-OFDM. Simultaneous Wireless Information and Power Transfer (SWIPT) applications typically operate in a high SNR regime, and both energy harvesting and information transfer are equally important. The cost of 12 dB performance with an AWGN noisy channel can be acceptable by saving a significant amount of power by removing the LO.
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- 2024
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50. 'Keep It Short and Simple': Perceptions of patients and healthcare professionals on the use of a mobile health app in the care for patients undergoing radical prostatectomy
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Andries Clinckaert, Lucas Schreurs, Lars Wouters, Wouter Everaerts, and Diederik De Cock
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mHealth ,mHealth app ,prostate cancer ,qualitative research ,radical prostatectomy ,urology ,Diseases of the genitourinary system. Urology ,RC870-923 - Abstract
Abstract Background Patients undergoing radical prostatectomy for localised prostate cancer generally have good long‐term survival rates. However, late recurrences can occur and require lifelong follow‐up. Objective This research aims to investigate different stakeholders' perceptions on the use of mobile health (mHealth) applications for prostate cancer follow‐up after radical prostatectomy. Methods A cross‐sectional qualitative study was conducted to explore stakeholders' perceptions of an mHealth application for follow‐up after radical prostatectomy. Urologists, nurses, and patients treated with radical prostatectomy were interviewed, and data were transcribed and analysed using thematic analysis according to Qualitative Analysis Guide of Leuven. Recommended features for an ideal mHealth application were grouped according to the Persuasive Systems Design model. Results and Limitations A total of 30 stakeholders, consisting of nurse specialists (n = 7), urologists (n = 8), and patients (n = 15), were interviewed. Expected benefits and barriers were mentioned and grouped in five overarching themes: healthcare optimisation, disease management, app compliance, legal and organisational requirements, and patient–mHealth interaction. Stakeholders provided a multitude of suggestions for an ideal mHealth app. Yet, not all types of stakeholders were interviewed, and patient selection limited generalisability of findings. Conclusions Stakeholders indicate that an mHealth app in the care for post‐prostatectomy patients can improve patient care and promote disease management but consider app compliance as a major challenge. Patient Summary We interviewed patients, nurses, and urologists about using an mHealth application for follow‐up after radical prostatectomy. The participants agreed that an mHealth app could improve care optimisation and disease management, but some concerns and barriers were expressed. This resulted in a list of recommended features for an ideal app.
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- 2024
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