3,685 results on '"Steffens P"'
Search Results
202. Confronting lattice parton distributions with global QCD analysis
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Bringewatt, J., Sato, N., Melnitchouk, W., Qiu, Jian-Wei, Steffens, F., and Constantinou, M.
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High Energy Physics - Phenomenology ,High Energy Physics - Lattice ,Nuclear Theory - Abstract
We present the first Monte Carlo based global QCD analysis of spin-averaged and spin-dependent parton distribution functions (PDFs) that includes nucleon isovector matrix elements in coordinate space from lattice QCD. We investigate the degree of universality of the extracted PDFs when the lattice and experimental data are treated under the same conditions within the Bayesian likelihood analysis. For the unpolarized sector, we find rather weak constraints from the current lattice data on the phenomenological PDFs, and difficulties in describing the lattice matrix elements at large spatial distances. In contrast, for the polarized PDFs we find good agreement between experiment and lattice data, with the latter providing significant constraints on the spin-dependent isovector quark and antiquark distributions., Comment: 23 pages, 4 figures
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- 2020
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203. Fractional antiferromagnetic skyrmion lattice induced by anisotropic couplings
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Gao, Shang, Rosales, H. D., Albarracín, F. A. Gómez, Tsurkan, Vladimir, Kaur, Guratinder, Fennell, Tom, Steffens, Paul, Boehm, Martin, Čermák, Petr, Schneidewind, Astrid, Ressouche, Eric, Cabra, Daniel C., Rüegg, Christian, and Zaharko, Oksana
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Condensed Matter - Strongly Correlated Electrons ,Condensed Matter - Mesoscale and Nanoscale Physics ,Condensed Matter - Materials Science - Abstract
Magnetic skyrmions are topological solitons with a nanoscale winding spin texture that hold promise for spintronics applications. Until now, skyrmions have been observed in a variety of magnets that exhibit nearly parallel alignment for the neighbouring spins, but theoretically, skyrmions with anti-parallel neighbouring spins are also possible. The latter, antiferromagnetic skyrmions, may allow more flexible control compared to the conventional ferromagnetic skyrmions. Here, by combining neutron scattering and Monte Carlo simulations, we show that a fractional antiferromagnetic skyrmion lattice with an incipient meron character is stabilized in MnSc$_2$S$_4$ through anisotropic couplings. Our work demonstrates that the theoretically proposed antiferromagnetic skyrmions can be stabilized in real materials and represents an important step towards implementing the antiferromagnetic-skyrmion based spintronic devices., Comment: 14 pages, 11 figures, submitted version with necessary edits
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- 2020
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204. Nature of the magnetic stripes in fully oxygenated La$_{2}$CuO$_{4+y}$
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Tutueanu, Ana-Elena, Jacobsen, Henrik, Ray, Pia Jensen, Holm-Dahlin, Sonja, Lacatusu, Monica-Elisabeta, Tejsner, Tim Birger, Grivel, Jean-Claude, Schmidt, Wolfgang, Toft-Petersen, Rasmus, Steffens, Paul, Boehm, Martin, Wells, Barrett, Udby, Linda, Lefmann, Kim, and Rømer, Astrid Tranum
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Condensed Matter - Superconductivity ,Physics - Applied Physics - Abstract
We present triple-axis neutron scattering studies of static and dynamic magnetic stripes in an optimally oxygen-doped cuprate superconductor, La$_{2}$CuO$_{4+y}$, which exhibits a clean superconducting transition at $T_{\rm c}=42$ K. Polarization analysis reveals that the magnetic stripe structure is equally represented along both of the tetragonal crystal axes and that the fluctuating stripes display significant weight for in-plane as well as out-of-plane spin components. Both static magnetic order as well as low-energy fluctuations are fully developed in zero applied magnetic field and the low-energy spin fluctuations at $\hbar \omega = 0.3-10$ meV intensify upon cooling. We interpret this as an indication that superconductivity and low-energy spin fluctuations co-exist microscopically in spatial regions which are separated from domains with static magnetic order., Comment: 16 pages, 6 figures
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- 2020
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205. Unpolarized and helicity generalized parton distributions of the proton within lattice QCD
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Alexandrou, Constantia, Cichy, Krzysztof, Constantinou, Martha, Hadjiyiannakou, Kyriakos, Jansen, Karl, Scapellato, Aurora, and Steffens, Fernanda
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High Energy Physics - Lattice ,High Energy Physics - Experiment ,High Energy Physics - Phenomenology ,High Energy Physics - Theory - Abstract
We present the first calculation of the $x$-dependence of the proton generalized parton distributions (GPDs) within lattice QCD. Results are obtained for the isovector unpolarized and helicity GPDs. We compute the appropriate matrix elements of fast-moving protons coupled to non-local operators containing a Wilson line. We present results for proton momenta $0.83,\,1.25,\,1.67$ GeV, and momentum transfer squared $0.69,\,1.38$ GeV$^2$. These combinations include cases with zero and nonzero skewness. The calculation is performed using one ensemble of two degenerate mass light, a strange and a charm quark of maximally twisted mass fermions with a clover term. The lattice results are matched to the light-cone GPDs using one-loop perturbation theory within the framework of large momentum effective theory. The final GPDs are given in the $\overline{\rm MS}$ scheme at a scale of 2 GeV., Comment: Main document: 5 pages, Supplementary document (Appendix): 10 pages. Version accepted for publication in Physical Review Letters
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- 2020
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206. Triplons, Magnons, and Spinons in a Single Quantum Spin System: SeCuO3
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Testa, Luc, Surija, Vinko, Prsa, Krunoslav, Steffens, Paul, Boehm, Martin, Bourges, Philippe, Berger, Helmut, Normand, Bruce, Ronnow, Henrik, and Zivkovic, Ivica
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Condensed Matter - Strongly Correlated Electrons - Abstract
Quantum spin systems exhibit an enormous range of collective excitations, but their spin waves, gapped triplons, fractional spinons, or yet other modes are generally held to be mutually exclusive. Here we show by neutron spectroscopy on SeCuO$_3$ that magnons, triplons, and spinons are present simultaneously. We demonstrate that this is a consequence of a structure consisting of two coupled subsystems and identify all the interactions of a minimal magnetic model. Our results serve qualitatively to open the field of multi-excitation spin systems and quantitatively to constrain the complete theoretical description of one member of this class of materials., Comment: 8 pages, 5 figures
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- 2020
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207. The role of zero-mode contributions in the matching for the twist-3 PDFs $e(x)$ and $h_{L}(x)$
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Bhattacharya, Shohini, Cichy, Krzysztof, Constantinou, Martha, Metz, Andreas, Scapellato, Aurora, and Steffens, Fernanda
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High Energy Physics - Phenomenology ,High Energy Physics - Lattice - Abstract
The perturbative procedure of matching was proposed to connect parton quasi-distributions that are calculable in lattice QCD to the corresponding light-cone distributions which enter physical processes. Such a matching procedure has so far been limited to the twist-2 distributions. Recently, we addressed the matching for the twist-3 PDF $g_T(x)$. In this work, we extend our perturbative calculations to the remaining twist-3 PDFs, $e(x)$ and $h_{L}(x)$. In particular, we discuss the non-trivialities involved in the calculation of the singular zero-mode contributions for the quasi-PDFs., Comment: 20 pages, 2 figures, results for zero-mode contributions partly revised, associated discussion modified
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- 2020
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208. Multiple scattering camouflaged as magnetic stripes in single crystals of superconducting (La,Sr)$_2$CuO$_4$
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Ţuţueanu, A. -E., Tejsner, T. B., Lǎcǎtuşu, M. E., Hansen, H. W., Eliasen, K. L., Boehm, M., Steffens, P., Niedermayer, C., and Lefmann, K.
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Condensed Matter - Superconductivity ,Physics - Instrumentation and Detectors - Abstract
Neutron diffraction has been a very prominent tool to investigate high-temperature superconductors, in particular through the discovery of an incommensurate magnetic signal known as stripes. We here report the findings of a neutron diffraction experiment on the superconductor (La,Sr)$_2$CuO$_4$, where a spurious signal appeared to be magnetic stripes. The signal strength was found to be strongly dependent on the neutron energy, peaking at $E = 4.6$~meV. We therefore attribute the origin of this signal to be a combination of multiple scattering and crystal twinning. A forward calculation of the scattering intensity including these two effects almost completely recovers our experimental observations. We emphasise the need for employing such analysis when searching for ways to avoid spurious scattering signals., Comment: 8 pages, 5 figures
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- 2020
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209. One-loop matching for the twist-3 parton distribution $g_T (x)$
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Bhattacharya, Shohini, Cichy, Krzysztof, Constantinou, Martha, Metz, Andreas, Scapellato, Aurora, and Steffens, Fernanda
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High Energy Physics - Phenomenology ,High Energy Physics - Lattice - Abstract
Perturbative matching relates the parton quasi-distributions, defined by Euclidean correlators at finite hadron momenta, to the light-cone distributions which are accessible in experiments. Previous matching calculations have exclusively focused on twist-2 distributions. In this work, we address, for the first time, the one-loop matching for the twist-3 parton distribution function $g_T(x)$. The results have been obtained using three different infrared regulators, while dimensional regularization has been adopted to deal with the ultraviolet divergences. We present the renormalized expressions of the matching coefficient for $g_{T}(x)$ in the $\overline{\rm MS}$ and modified $\overline{\rm MS}$ schemes. We also discuss the role played by a zero-mode contribution. Our results have already been used for the extraction of $g_T(x)$ from lattice QCD calculations., Comment: 16 pages, 2 figures; V2: minor changes, PRD version; V3: results for zero-mode contribution partly revised
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- 2020
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210. New insights on proton structure from lattice QCD: the twist-3 parton distribution function $g_T(x)$
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Bhattacharya, Shohini, Cichy, Krzysztof, Constantinou, Martha, Metz, Andreas, Scapellato, Aurora, and Steffens, Fernanda
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High Energy Physics - Lattice ,High Energy Physics - Phenomenology - Abstract
In this work, we present the first-ever calculation of the isovector flavor combination of the twist-3 parton distribution function $g_T(x)$ for the proton from lattice QCD. We use an ensemble of gauge configurations with two degenerate light, a strange and a charm quark ($N_f=2+1+1$) of maximally twisted mass fermions with a clover improvement. The lattice has a spatial extent of 3~fm, lattice spacing of 0.093~fm, and reproduces a pion mass of $260$ MeV. We use the quasi-distribution approach and employ three values of the proton momentum boost, 0.83 GeV, 1.25 GeV, and 1.67 GeV. We use a source-sink separation of 1.12~fm to suppress excited-states contamination. The lattice data are renormalized non-perturbatively. We calculate the matching equation within Large Momentum Effective Theory, which is applied to the lattice data in order to obtain $g_T$. The final distribution is presented in the $\overline{\rm MS}$ scheme at a scale of 2 GeV. We also calculate the helicity distribution $g_1$ to test the Wandzura-Wilczek approximation for $g_T$. We find that the approximation works well for a broad range of $x$. This work demonstrates the feasibility of accessing twist-3 parton distribution functions from novel methods within lattice QCD and can provide essential insights into the structure of hadrons., Comment: 10 pages, 6 figures, version accepted for publication
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- 2020
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211. Effect of Nd and Rh substitution on the spin dynamics of Kondo insulator CeFe2Al10
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Alekseev, P. A., Mignot, J. -M., Adroja, D. T., Lazukov, V. N., Tanida, H., Muro, Y., Sera, M., Takabatake, T., Steffens, P., and Rols, S.
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Condensed Matter - Strongly Correlated Electrons - Abstract
The dynamic magnetic properties of the Kondo-insulator state in CeFe2Al10 (spin gap, resonance mode) have been investigated using polarized neutrons on a single crystal of pure CeFe2Al10. The results indicate that the magnetic excitations are polarized mainly along the orthorhombic a axis and their dispersion along the orthorhombic c direction could be determined. Polycrystalline samples of Nd- and Rh-doped CeFe2Al0 were also studied by the time-of-flight technique, with the aim of finding out how the low-energy magnetic excitation spectra change upon isoelectronic substitution of the rare-earth (Nd) on the magnetic Ce site or electron doping (Rh) on the transition-element Fe sublattice. The introduction of magnetic Nd impurities strongly modifies the spin gap in the Ce dynamic magnetic response and causes the appearance of a quasielastic signal. The crystal-field excitations of Nd, studied in both LaFe2Al10 and CeFe2Al10, also reveal a significant influence of f-electron hybridization (largest in the case of Ce) on the crystal-field potential. As a function of the Rh concentration, a gradual change is observed from a Kondo-insulator to a metallic Kondo-lattice response, likely reflecting the decrease in the hybridization energy., Comment: 27 pages, 15 figures
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- 2020
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212. Parton distribution functions of $\Delta^+$ on the lattice
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Chai, Yahui, Li, Yuan, Xia, Shicheng, Alexandrou, Constantia, Cichy, Krzysztof, Constantinou, Martha, Feng, Xu, Hadjiyiannakou, Kyriakos, Jansen, Karl, Koutsou, Giannis, Liu, Chuan, Scapellato, Aurora, and Steffens, Fernanda
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High Energy Physics - Lattice ,High Energy Physics - Phenomenology - Abstract
We perform a first calculation for the unpolarized parton distribution function of the $\Delta^+$ baryon using lattice QCD simulations within the framework of Large Momentum Effective Theory. Two ensembles of $N_f=2+1+1$ twisted mass fermions are utilized with a pion mass of 270 MeV and 360 MeV, respectively. The baryon, which is treated as a stable single-particle state, is boosted with momentum $P_3$ with values $\{0.42,0.83,1.25\}$ GeV, and we utilize momentum smearing to improve the signal. The unpolarized parton distribution function of $\Delta^+$ is obtained using a non-perturbative renormalization and a one-loop formula for the matching, with encouraging precision. In particular, we compute the $\overline{d}(x)-\overline{u}(x)$ asymmetry and compare it with the same quantity in the nucleon, in a first attempt towards resolving the physical mechanism responsible for generating such asymmetry.
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- 2020
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213. Improvement, generalization, and scheme conversion of Wilson-line operators on the lattice in the auxiliary field approach
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Green, Jeremy R., Jansen, Karl, and Steffens, Fernanda
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High Energy Physics - Lattice ,High Energy Physics - Phenomenology - Abstract
Nonlocal quark bilinear operators connected by link paths are used for studying parton distribution functions (PDFs) and transverse momentum-dependent PDFs of hadrons using lattice QCD. The nonlocality makes it difficult to understand the renormalization and improvement of these operators using standard methods. In previous work, we showed that by introducing an auxiliary field on the lattice, one can understand an on-axis Wilson-line operator as the product of two local operators in an extended theory. In this paper, we provide details about the calculation in perturbation theory of the factor for conversion from our lattice-suitable renormalization scheme to the MS-bar scheme. Extending our work, we study Symanzik improvement of the extended theory to understand the pattern of discretization effects linear in the lattice spacing, $a$, which are present even if the lattice fermion action exactly preserves chiral symmetry. This provides a prospect for an eventual $O(a)$ improvement of lattice calculations of PDFs. We also generalize our approach to apply to Wilson lines along lattice diagonals and to piecewise-straight link paths., Comment: 15 pages, 4 figures. v2: minor errors corrected
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- 2020
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214. Malolactic fermentation of lactic acid bacteria isolated from southern Brazilian red wine
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Miotto, Shana Paula Segala, Fensterseifer, Letícia Caroline, de Souza Hassemer, Guilherme, Martins, Guilherme, Ficagna, Evandro, Steffens, Juliana, Puton, Bruna Maria Saorin, Backes, Geciane Toniazzo, Valduga, Eunice, and Cansian, Rogério Luis
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- 2023
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215. The concept of 'Work-Life-Blending': a systematic review
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Katharina Steffens, Christine Sutter, and Sandra Sülzenbrück
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systematic review ,Work-Life-Blending ,boundary management ,Borders ,domains ,work ,Psychology ,BF1-990 - Abstract
Work-Life Blending refers to the permeability and dissolution of boundaries between work and personal life, bringing these domains closer together. However, a comprehensive, holistic definition or conceptualisation of Work-Life-Blending is currently lacking. This research aims to address this gap by conducting a systematic literature review to define and clarify the concept. The primary objective is to identify the key factors and dimensions of Work-Life-Blending by reviewing the current state of research, and by offering a clear and precise conceptual framework to guide further research in developing measurable and concrete concepts. We conducted a systematic review following the PRISMA guidelines to achieve this, drawing on keyword-based searches. We searched for English or German manuscripts in the electronic databases Business Source Premier and PsycARTICLES, using keywords such as “blending,” “blurring,” “fusion,” “Entgrenzung,” “Verschmelzung,” “Vermischung,” “boundary,” “border,” or “demarcation” in combination with “work” and “life.” From 1,400 screened references between 2000 and 2023, we identified 302 eligible articles. After applying exclusion criteria, 51 records were retained. Employing a holistic approach, we developed a coding scheme to analyse the articles focusing on antecedents, processes, and outcomes of Work-Life-Blending. Articles were prioritized based on their impact, relevance, and data content. Our analysis revealed a diverse field, and we adopted Clark’s central concepts (2000) to categorize Work-Life Blending into four key areas: Domains, Borders, Individual, and Interindividual. Structural analysis allowed us to gain deeper insights into the multifaceted nature of the research field. Diversification was evident in studies exploring various aspects, such as the combination of dimensions (e.g., organizational and individual factors), correlations between factors (e.g., working conditions), and the introduction of new constructs (e.g., motivational processes). Our research addresses a significant knowledge gap in the field of Work-Life-Blending, making valuable contributions to the existing body of knowledge. By examining key categories and proposing an extended definition, this study provides a robust foundation for further investigations. As a result, we established a classification of the determinants. Given the high degree of diversification, we offer a comprehensive framework for future research, contributing to a deeper understanding of Work-Life Blending.
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- 2023
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216. The influence of the summer pruning on ‘Fuji’ apples storage under controlled atmosphere
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Adriana Lugaresi, Cristiano André Steffens, Angélica Schmitz Heinzen, Cristhian Leonardo Fenili, Alberto Fontanella Brighenti, Mariuccia Schlichting De Martin, and Cassandro Vidal Talamini do Amarante
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Malus domestica Borkh. ,postharvest ,functional compounds ,physiological disorders. ,Agriculture (General) ,S1-972 - Abstract
This study aimed to evaluate the effect of the summer pruning time in ‘Fuji’ apple trees on the quality of fruit at harvest and after storage in controlled atmosphere with extremely low O2 (CA-ELO) (0.5 kPa O2). The treatments evaluated were summer pruning in December, January, and February, in addition to a control treatment (without summer pruning). The experiment was carried out in the 2018/2019 and 2019/2020 growing seasons. The fruit were evaluated at harvest and after eight months of CA-ELO (0.5 kPa O2 +
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- 2023
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217. Social participation during the COVID-19 pandemic in persons with a high risk for a severe course of COVID-19 – results of a longitudinal, multi-center observational study in Germany
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Dominik Schröder, Christina Müllenmeister, Stephanie Heinemann, Eva Hummers, Frank Klawonn, Kai Vahldiek, Alexandra Dopfer-Jablonka, Sandra Steffens, Marie Mikuteit, Jacqueline Niewolik, Tobias R. Overbeck, Jonathan Kallusky, Gloria Königs, Gloria Heesen, Tim Schmachtenberg, and Frank Müller
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SARS-CoV-2 ,COVID-19 ,social participation ,longitudinal study ,pandemic ,Medicine ,Psychology ,BF1-990 - Abstract
ABSTRACTObjective The COVID-19 pandemic has affected how people go about their daily lives, often in various and substantial ways. This study aims to prospectively evaluate the changes in social participation during the COVID-19 pandemic in persons with a high risk for a severe COVID-19 course in Germany.Methods A paper-pencil-based survey was conducted starting at March 2021. Participants filled out questionnaires at four time points based on their COVID-19 vaccination status: before COVID-19 vaccination, one month, six months and twelve months after COVID-19 vaccination. Social participation measures included the Pandemic Social Participation Questionnaire (PSP-Q) and the Index for measuring participation restrictions (IMET). Repeated measures ANOVA and paired t-test were used to test for changes between time-points. Repeated measures correlation was used to assess the relationship between social participation and local COVID-19 incidences.Results Data from 245 participants was analyzed before and one month after COVID-19 vaccination. In addition, data from 156 participants was analyzed at time points one, six and twelve months after COVID-19. PSP-Q and IMET scores changed significantly after participants received a COVID-19 vaccination. Between one month and twelve months after vaccination, social participation improved significantly measured by PSP-Q. Social participation was negatively correlated with regional COVID-19 incidences before and after COVID-19 vaccination. Social participation was positively correlated with COVID-19 incidences between one month and twelve months after COVID-19 vaccination.Conclusions Social participation improved in persons with a high risk for a severe COVID-19 course during the pandemic. The local COVID-19 incidence showed a negative association with social participation only until the fall of 2021 when it was used as the sole metric to regulate COVID-19 protective measures. Although our data describes the trends in social participation, further studies are needed to identify the influencing factors for the observed increase in social participation.
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- 2023
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218. Managing children with daytime urinary incontinence: a survey of Dutch general practitioners
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Antal P. Oldenhof, J. Marleen Linde, Ilse Hofmeester, Martijn G. Steffens, Francis J. Kloosterman-Eijgenraam, and Marco H. Blanker
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Surveys ,general practice/family medicine ,urology ,paediatrics ,Medicine (General) ,R5-920 - Abstract
AbstractBackground In the Netherlands, parents of children with daytime urinary incontinence (UI) first consult general practitioners (GPs). However, GPs need more specific guidelines for daytime UI management, resulting in care and referral decisions being made without clear guidance.Objectives We aimed to identify Dutch GP considerations when treating and referring a child with daytime UI.Methods We invited GPs who referred at least one child aged 4–18 years with daytime UI to secondary care. They were asked to complete a questionnaire about the referred child and the management of daytime UI in general.Results Of 244 distributed questionnaires, 118 (48.4%) were returned by 94 GPs. Most reported taking a history and performing basic diagnostic tests like urine tests (61.0%) and physical examinations (49.2%) before referral. Treatment mostly involved lifestyle advice, with only 17.8% starting medication. Referrals were usually at the explicit wish of the child/parent (44.9%) or because of symptom persistence despite treatment (39.0%). GPs usually referred children to a paediatrician (n = 99, 83.9%), only referring to a urologist in specific situations. Almost half (41.4%) of the GPs did not feel competent to treat children with daytime UI and more than half (55.7%) wanted a clinical practice guideline. In the discussion, we explore the generalisability of our findings to other countries.Conclusion GPs usually refer children with daytime UI to a paediatrician after a basic diagnostic assessment, usually without offering treatment. Parental or child demand is the primary stimulus for referral.
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- 2023
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219. Evaluation of the National Competence Based Catalogue of Learning Objectives (NKLM 2.0) for undergraduate medical education at the Medical School Hannover
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Mikuteit, Marie, Just, Ingo, and Steffens, Sandra
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national competence based catalogue of learning objectives for undergraduate medical education (nklm) ,evaluation ,phase one ,phase two ,teaching ,curriculum ,Special aspects of education ,LC8-6691 ,Medicine - Abstract
Background: The National Competence-Based Catalogue of Learning Objectives for Undergraduate Medical Education (NKLM) serves as the foundation for curricular development in undergraduate medical education in Germany. A new version of the NKLM was launched in 2021, and medical faculties are now evaluating the learning objectives (LOs). This paper describes the evaluation process used at Hannover Medical School.Methods: The evaluation process was structured in three steps. LOs were rated as “keep”, “modify” or “delete”. First, the 1133 LOs were compared with the mapping of the Hannover curriculum from 2017. Then, a small team from the Curricular Development Department conducted a pre-evaluation of the 1133 LOs. Finally, a group of clinical experts and students discussed and agreed on the ratings.Results: For 868 LOs, one or more counterparts were found in the mapping, but 265 new LOs were not found and thus, classified as new. In the first rating, 779 LOs were kept, 300 were modified (172 due to wording), 45 were deleted, and there was no rating for 9 LOs. The expert group changed 47 of the pre-evaluation decisions. The final rating was to keep 738 LOs, modify 356, and delete 39 LOs.Conclusion: This method effectively evaluated the LOs from NKLM 2.0 while balancing expert knowledge and an overview of the curriculum.
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- 2023
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220. Sex- and age-related differences in the inflammatory properties of cardiac fibroblasts: impact on the cardiosplenic axis and cardiac fibrosis
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Kathleen Pappritz, Sarah-Lena Puhl, Isabel Matz, Erik Brauer, Yi Xuan Shia, Muhammad El-Shafeey, Suzanne E. Koch, Kapka Miteva, Christin Mucha, Georg N. Duda, Ansgar Petersen, Sabine Steffens, Carsten Tschöpe, and Sophie Van Linthout
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aging ,sex ,cardiac fibroblasts ,cardiosplenic axis ,monocytes ,fibrosis ,Diseases of the circulatory (Cardiovascular) system ,RC666-701 - Abstract
BackgroundAge and sex are prominent risk factors for heart failure and determinants of structural and functional changes of the heart. Cardiac fibroblasts (cFB) are beyond their task as extracellular matrix-producing cells further recognized as inflammation-supporting cells. The present study aimed to evaluate the impact of sex and age on the inflammatory potential of cFB and its impact on the cardiosplenic axis and cardiac fibrosis.MaterialsLeft ventricles (LV) of 3- and 12-months old male and female C57BL/6J mice were harvested for immunohistochemistry, immunofluorescence and cFB outgrowth culture and the spleen for flow cytometry. LV-derived cFB and respective supernatants were characterized.ResultsLV-derived cFB from 3-months old male mice exhibited a higher inflammatory capacity, as indicated by a higher gene expression of CC-chemokine ligand (CCL) 2, and CCL7 compared to cFB derived from 3-months old female mice. The resulting higher CCL2/chemokine C-X3-C motif ligand (Cx3CL1) and CCL7/Cx3CL1 protein ratio in cell culture supernatants of 3-months old male vs. female cFB was reflected by a higher migration of Ly6Chigh monocytes towards supernatant from 3-months old male vs. female cFB. In vivo a lower ratio of splenic pro-inflammatory Ly6Chigh to anti-inflammatory Ly6Clow monocytes was found in 3-months old male vs. female mice, suggesting a higher attraction of Ly6Chigh compared to Ly6Clow monocytes towards the heart in male vs. female mice. In agreement, the percentage of pro-inflammatory CD68+ CD206− macrophages was higher in the LV of male vs. female mice at this age, whereas the percentage of anti-inflammatory CD68+ CD206+ macrophages was higher in the LV of 3-months old female mice compared to age-matched male animals. In parallel, the percentage of splenic TGF-β+ cells was higher in both 3- and 12-months old female vs. male mice, as further reflected by the higher pro-fibrotic potential of female vs. male splenocytes at both ages. In addition, female mice displayed a higher total LV collagen content compared to age-matched male mice, whereby collagen content of female cFB was higher compared to male cFB at the age of 12-months.ConclusionAge- and sex-dependent differences in cardiac fibrosis and inflammation are related to age- and sex-dependent variations in the inflammatory properties of cardiac fibroblasts.
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- 2023
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221. Race and Gender Differences in Awareness of Colorectal Cancer Screening Tests and Guidelines Among Recently Diagnosed Colon Cancer Patients in an Urban Setting
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Carnahan, Leslie R, Jones, Lindsey, Brewer, Katherine C, Watts, Elizabeth A, Peterson, Caryn E, Ferrans, Carol Estwing, Cipriano-Steffens, Toni, Polite, Blase, Maker, Ajay V, Chowdhery, Rozina, Molina, Yamilé, and Rauscher, Garth H
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Biomedical and Clinical Sciences ,Public Health ,Health Sciences ,Clinical Sciences ,Digestive Diseases ,Cancer ,Colo-Rectal Cancer ,Prevention ,Health Services ,Clinical Research ,Aging ,4.4 Population screening ,Detection ,screening and diagnosis ,4.2 Evaluation of markers and technologies ,Colonic Neoplasms ,Colonoscopy ,Colorectal Neoplasms ,Early Detection of Cancer ,Humans ,Male ,Mass Screening ,Occult Blood ,Sex Factors ,Awareness ,Colon cancer ,Gender ,Racial disparities ,Screening ,Nursing ,Public Health and Health Services ,Oncology and carcinogenesis ,Public health - Abstract
The purpose of this study was to first characterize the prevalence of recall, recognition, and knowledge of colon cancer screening tests and guidelines (collectively, "awareness") among non-Hispanic black (NHB) and NH white (NHW) urban colon cancer patients. Second, we sought to examine whether awareness was associated with mode of cancer detection. Low awareness regarding colon cancer screening tests and guidelines may explain low screening rates and high prevalence of symptomatic detection. We examined recall, recognition, and knowledge of colorectal cancer (CRC) screening tests and guidelines and their associations with mode of cancer detection (symptomatic versus screen-detected) in 374 newly diagnosed NHB and NHW patients aged 45-79. Patients were asked to name or describe any test to screen for colon cancer (recall); next, they were given descriptions of stool testing and colonoscopy and asked if they recognized each test (recognition). Lastly, patients were asked if they knew the screening guidelines (knowledge). Overall, awareness of CRC screening guidelines was low; just 20% and 13% of patients knew colonoscopy and fecal test guidelines, respectively. Awareness of CRC screening tests and guidelines was especially low among NHB males, socioeconomically disadvantaged individuals, and those diagnosed at public healthcare facilities. Inability to name or recall a single test was associated with reduced screen-detected cancer compared with recall of at least one test (36% vs. 22%, p = 0.01). Low awareness of CRC screening tests is a risk factor for symptomatic detection of colon cancer.
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- 2021
222. Stationary optomechanical entanglement between a mechanical oscillator and its measurement apparatus
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Gut, C., Winkler, K., Hoelscher-Obermaier, J., Hofer, S. G., Nia, R. Moghadas, Walk, N., Steffens, A., Eisert, J., Wieczorek, W., Slater, J. A., Aspelmeyer, M., and Hammerer, K.
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Quantum Physics ,Condensed Matter - Mesoscale and Nanoscale Physics - Abstract
We provide an argument to infer stationary entanglement between light and a mechanical oscillator based on continuous measurement of light only. We propose an experimentally realizable scheme involving an optomechanical cavity driven by a resonant, continuous-wave field operating in the non-sideband-resolved regime. This corresponds to the conventional configuration of an optomechanical position or force sensor. We show analytically that entanglement between the mechanical oscillator and the output field of the optomechanical cavity can be inferred from the measurement of squeezing in (generalized) Einstein-Podolski-Rosen quadratures of suitable temporal modes of the stationary light field. Squeezing can reach levels of up to 50% of noise reduction below shot noise in the limit of large quantum cooperativity. Remarkably, entanglement persists even in the opposite limit of small cooperativity. Viewing the optomechanical device as a position sensor, entanglement between mechanics and light is an instance of object-apparatus entanglement predicted by quantum measurement theory., Comment: 18 pages, 7 figures
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- 2019
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223. Electricity Load Forecasting -- An Evaluation of Simple 1D-CNN Network Structures
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Lang, Christian, Steinborn, Florian, Steffens, Oliver, and Lang, Elmar W.
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Computer Science - Machine Learning ,Statistics - Machine Learning - Abstract
This paper presents a convolutional neural network (CNN) which can be used for forecasting electricity load profiles 36 hours into the future. In contrast to well established CNN architectures, the input data is one-dimensional. A parameter scanning of network parameters is conducted in order to gain information about the influence of the kernel size, number of filters, and dense size. The results show that a good forecast quality can already be achieved with basic CNN architectures.The method works not only for smooth sum loads of many hundred consumers, but also for the load of apartment buildings., Comment: Presented at the ITISE 2019 in Granada
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- 2019
224. The Relevance of Leisure Noise to Hearing Threshold Shifts: A Longitudinal Analysis among Adolescents
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Walser-Reichenbach, Sandra M., Gerstner, Doris G., Twardella, Dorothee, Jenkac, Christina, Weilnhammer, Veronika, Hendrowarsito, Lana, Perez-Alvarez, Carmelo, Steffens, Thomas, Stilianakis, Nikolaos I., Herr, Caroline E. W., and Heinze, Stefanie
- Abstract
Purpose: The aim of this study was to analyze the association of total leisure noise exposure and hearing threshold shifts over 5 years among adolescents enrolled in the Ohrkan cohort study. Method: The Ohrkan cohort of 2,148 students aged 13-19 years was recruited from 2009 to 2011 and followed up 5 years later. Complete baseline and follow-up reports on exposure and outcome were available for 989 participants. Leisure noise exposure was assessed by questionnaires, and clinical audiometric examinations were performed. Two outcomes were defined: occurrence of the Niskar notch pattern and audiometry showing maximum hearing threshold values at 3, 4, and 6 kHz (both ears). Longitudinal analysis using generalized estimating equations was performed. Results: High total leisure noise exposure, defined as an energy equivalent of a 40-hr week of > 85 dBA, was estimated for 32.7% of students at baseline and 63.8% at follow-up. A noise notch was observed in 1.1% of adolescents at baseline and 3.3% at follow-up. At baseline, the maximum measured threshold shift was 55 dB, which increased to 85 dB at the follow-up. Longitudinal analysis did not reveal an association between leisure noise exposure and hearing thresholds. Hearing threshold shifts or noise notches were associated with sex, school type, and time point of measurement. Conclusions: No relationship was found between leisure noise and hearing thresholds. Male adolescents and those attending secondary general schools, with graduation following completion of ninth or 10th grade, had a greater likelihood of developing hearing threshold shifts. Prevention programs should focus on these risk groups.
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- 2022
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225. Meta-Analytic Use of Balanced Identity Theory to Validate the Implicit Association Test
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Cvencek, Dario, Meltzoff, Andrew N, Maddox, Craig D, Nosek, Brian A, Rudman, Laurie A, Devos, Thierry, Dunham, Yarrow, Baron, Andrew S, Steffens, Melanie C, Lane, Kristin, Horcajo, Javier, Ashburn-Nardo, Leslie, Quinby, Amanda, Srivastava, Sameer B, Schmidt, Kathleen, Aidman, Eugene, Tang, Emilie, Farnham, Shelly, Mellott, Deborah S, Banaji, Mahzarin R, and Greenwald, Anthony G
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Clinical and Health Psychology ,Psychology ,Behavioral and Social Science ,Attitude ,Female ,Humans ,Male ,Models ,Psychological ,Reproducibility of Results ,Self Concept ,Self Report ,Social Identification ,Statistics as Topic ,Stereotyping ,attitudes ,stereotypes ,identity ,self-esteem ,Implicit Association Test ,Cognitive Sciences ,Social Psychology ,Social and personality psychology - Abstract
This meta-analysis evaluated theoretical predictions from balanced identity theory (BIT) and evaluated the validity of zero points of Implicit Association Test (IAT) and self-report measures used to test these predictions. Twenty-one researchers contributed individual subject data from 36 experiments (total N = 12,773) that used both explicit and implicit measures of the social-cognitive constructs. The meta-analysis confirmed predictions of BIT's balance-congruity principle and simultaneously validated interpretation of the IAT's zero point as indicating absence of preference between two attitude objects. Statistical power afforded by the sample size enabled the first confirmations of balance-congruity predictions with self-report measures. Beyond these empirical results, the meta-analysis introduced a within-study statistical test of the balance-congruity principle, finding that it had greater efficiency than the previous best method. The meta-analysis's full data set has been publicly archived to enable further studies of interrelations among attitudes, stereotypes, and identities.
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- 2021
226. Cost Effectiveness of Rectal Culture-based Antibiotic Prophylaxis in Transrectal Prostate Biopsy: The Results from a Randomized, Nonblinded, Multicenter Trial
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Sofie C.M. Tops, Eva Kolwijck, Evert L. Koldewijn, Diederik M. Somford, Filip J.M. Delaere, Menno A. van Leeuwen, Anthonius J. Breeuwsma, Thijn F. de Vocht, Hans J.H.P. Broos, Rob A. Schipper, Martijn G. Steffens, Marjolijn C.A. Wegdam-Blans, Els de Brauwer, Wouter van den Bijllaardt, Alexander C.A.P. Leenders, J.P. Michiel Sedelaar, Heiman F.L. Wertheim, and Eddy Adang
- Subjects
Cost effectiveness ,Culture-based antibiotic prophylaxis ,Empirical antibiotic prophylaxis ,Infectious complications ,Transrectal prostate biopsy ,Diseases of the genitourinary system. Urology ,RC870-923 ,Neoplasms. Tumors. Oncology. Including cancer and carcinogens ,RC254-282 - Abstract
Background: Culture-based antibiotic prophylaxis is a plausible strategy to reduce infections after transrectal prostate biopsy (PB) related to fluoroquinolone-resistant pathogens. Objective: To assess the cost effectiveness of rectal culture-based prophylaxis compared with empirical ciprofloxacin prophylaxis. Design, setting, and participants: The study was performed alongside a trial in 11 Dutch hospitals investigating the effectiveness of culture-based prophylaxis in transrectal PB between April 2018 and July 2021 (trial registration number: NCT03228108). Intervention: Patients were 1:1 randomized for empirical ciprofloxacin prophylaxis (oral) or culture-based prophylaxis. Costs for both prophylactic strategies were determined for two scenarios: (1) all infectious complications within 7 d after biopsy and (2) culture-proven Gram-negative infections within 30 d after biopsy. Outcome measurements and statistical analysis: Differences in costs and effects (quality-adjusted life-years [QALYs]) were analyzed from a healthcare and societal perspective (including productivity losses, and travel and parking costs) using a bootstrap procedure presenting uncertainty surrounding the incremental cost-effectiveness ratio in a cost-effectiveness plane and acceptability curve. Results and limitations: For the 7-d follow-up period, culture-based prophylaxis (n = 636) was €51.57 (95% confidence interval [CI] 6.52–96.63) more expensive from a healthcare perspective and €16.95 (95% CI –54.29 to 88.18) from a societal perspective than empirical ciprofloxacin prophylaxis (n = 652). Ciprofloxacin-resistant bacteria were detected in 15.4%. Extrapolating our data, from a healthcare perspective, 40% ciprofloxacin resistance would lead to equal cost for both strategies. Results were similar for the 30-d follow-up period. No significant differences in QALYs were observed. Conclusions: Our results should be interpreted in the context of local ciprofloxacin resistance rates. In our setting, from a healthcare perspective, culture-based prophylaxis was significantly more expensive than empirical ciprofloxacin prophylaxis. From a societal perspective, culture-based prophylaxis was somewhat more cost effective against the threshold value customary for the Netherlands (€80.000). Patient summary: Culture-based prophylaxis in transrectal prostate biopsy was not associated with reduced costs compared with empirical ciprofloxacin prophylaxis.
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- 2023
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227. Expanded profiling of Remdesivir as a broad-spectrum antiviral and low potential for interaction with other medications in vitro
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Sheli R. Radoshitzky, Patrick Iversen, Xianghan Lu, Jing Zou, Suzanne J. F. Kaptein, Kelly S. Stuthman, Sean A. Van Tongeren, Jesse Steffens, Ruoyu Gong, Hoa Truong, Annapurna A. Sapre, Huiling Yang, Xiaodong Xie, Jia Jun Chia, Zhijuan J. Song, Stacey M. Leventhal, Josolyn Chan, Alex Shornikov, Xin Zhang, David Cowfer, Helen Yu, Travis Warren, Tomas Cihlar, Danielle P. Porter, Johan Neyts, Pei-Yong Shi, Jay Wells, John P. Bilello, and Joy Y. Feng
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Medicine ,Science - Abstract
Abstract Remdesivir (GS-5734; VEKLURY) is a single diastereomer monophosphoramidate prodrug of an adenosine analog (GS-441524). Remdesivir is taken up by target cells and metabolized in multiple steps to form the active nucleoside triphosphate (GS-443902), which acts as a potent inhibitor of viral RNA-dependent RNA polymerases. Remdesivir and GS-441524 have antiviral activity against multiple RNA viruses. Here, we expand the evaluation of remdesivir’s antiviral activity to members of the families Flaviviridae, Picornaviridae, Filoviridae, Orthomyxoviridae, and Hepadnaviridae. Using cell-based assays, we show that remdesivir can inhibit infection of flaviviruses (such as dengue 1–4, West Nile, yellow fever, Zika viruses), picornaviruses (such as enterovirus and rhinovirus), and filoviruses (such as various Ebola, Marburg, and Sudan virus isolates, including novel geographic isolates), but is ineffective or is significantly less effective against orthomyxoviruses (influenza A and B viruses), or hepadnaviruses B, D, and E. In addition, remdesivir shows no antagonistic effect when combined with favipiravir, another broadly acting antiviral nucleoside analog, and has minimal interaction with a panel of concomitant medications. Our data further support remdesivir as a broad-spectrum antiviral agent that has the potential to address multiple unmet medical needs, including those related to antiviral pandemic preparedness.
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- 2023
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228. Contralateral lymph node metastasis in recurrent ipsilateral breast cancer with Lynch syndrome: a locoregional event
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Tibor A. Zwimpfer, Fabienne D. Schwab, Daniel Steffens, Felix Kaul, Noemi Schmidt, James Geiger, Franziska Geissler, Viola Heinzelmann-Schwarz, Walter P. Weber, and Christian Kurzeder
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Breast neoplasms ,Recurrence ,Lynch syndrome ,Lymphoscintigraphy ,Sentinel lymph node biopsy ,Surgery ,RD1-811 ,Neoplasms. Tumors. Oncology. Including cancer and carcinogens ,RC254-282 - Abstract
Abstract Introduction Contralateral axillary lymph node metastasis (CALNM) in breast cancer (BC) is considered a distant metastasis, marking stage 4cancer. Therefore, it is generally treated as an incurable disease. However, in clinical practice, staging and treatment remain controversial due to a paucity of data, and the St. Gallen 2021 consensus panel recommended a curative approach in patients with oligometastatic disease. Aberrant lymph node (LN) drainage following previous surgery or radiotherapy is common. Therefore, CALNM may be considered a regional event rather than systemic disease, and a re-sentinel procedure aided by lymphoscintigraphy permits adequate regional staging. Case report Here, we report a 37-year-old patient with Lynch syndrome who presented with CALNM in an ipsilateral relapse of a moderately differentiated invasive ductal BC (ER 90%, PR 30%, HER2 negative, Ki-67 25%, microsatellite stable), 3 years after the initial diagnosis. Lymphoscintigraphy detected a positive sentinel LN in the contralateral axilla despite no sign of LN involvement or distant metastases on FDG PET/CT or MRI. The patient underwent bilateral mastectomy with sentinel node dissection, surgical reconstruction with histological confirmation of the CALNM, left axillary dissection, adjuvant chemotherapy, and anti-hormone therapy. In addition to her regular BC follow-up visits, the patient will undergo annual colonoscopy, gastroscopy, abdominal, and vaginal ultrasound screening. In January 2023, the patient was free of progression for 23 months after initiation of treatment for recurrent BC and CALNM. Conclusion This case highlights the value of delayed lymphoscintigraphy and the contribution of sentinel procedure for local control in the setting of recurrent BC. Aberrant lymph node drainage following previous surgery may be the underlying cause of CALNM. We propose that CALNM without evidence of systemic metastasis should be considered a regional event in recurrent BC, and thus, a curative approach can be pursued. The next AJCC BC staging should clarify the role of CALNM in recurrent BC to allow for the development of specific treatment guidelines.
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- 2023
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229. Functional Outcomes Following Cytoreductive Surgery and Hyperthermic Intraperitoneal Chemotherapy: A Prospective Cohort Study
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Makker, Preet G. S., Koh, Cherry E., Ansari, Nabila, Gonzaga, Nicole, Bartyn, Jenna, Solomon, Michael, and Steffens, Daniel
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- 2023
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230. Directing the Way—Receptor and Chemical Targeting Strategies for Nucleic Acid Delivery
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Steffens, Ricarda Carolin and Wagner, Ernst
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- 2023
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231. Combination of chemical coagulation and membrane-based separation for dairy wastewater treatment
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Bortoluzzi, Airton C., Demaman Oro, Carolina E., dos Santos, Maicon S. N., Mignoni, Marcelo L., Dallago, Rogério M., Steffens, Juliana, and Tres, Marcus V.
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- 2023
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232. Übersetzung der 2018 EULAR Empfehlungen zu körperlicher Aktivität von Menschen mit entzündlich-rheumatischen und degenerativen Erkrankungen ins Deutsche und sprachliche Validierung im deutschsprachigen Raum mit medizinischen Fachpersonen
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Kiltz, Uta, Kiefer, David, Braun, Jürgen, Rausch-Osthoff, Anne-Kathrin, Herbold, Susanne, Klinger, Meike, Kocher, Agnes, Nell-Duxneuner, Valerie, Reichenbach, Stefan, Stamm, Tanja, Steffens-Korbanka, Patricia, and Niedermann, Karin
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- 2023
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233. CRT in Praxis: Library and Archival Collections at San José State University
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Roy, Mantra, Steffens, Kate, Cabrera, Peggy, Strykowski, Jill, and Megwalu, Anamika
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Through various efforts, the staff and faculty of San José State University's Dr. Martin Luther King, Jr. Library (King Library) are working towards creating more equitable and inclusive collections. Examining the library's collecting practices and collections by and about African Americans, this article presents the ongoing work of a working group that was formed in 2020 in response to an Anti-Racism Action Plan developed in the library. By using some of the tenets of the CRT framework such as intersectionality, counter-storytelling, and deconstructing colorblindness and white supremacy, the authors discuss the steps that are being taken to revise, review, and revisit the King Library's collecting practices in relation to the history of SJSU's African American Studies program, the Africana Center, and other relevant community history.
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- 2022
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234. Iron supplementation does not aggravate impaired glucose tolerance and sugar overload-induced genotoxicity in rats
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Molz, Patrícia, Dallemole, Danieli Rosane, Molz, Walter Augusto, Priebe Steffens, Juliana, Wildner Maluf, Sharbel, Baroni Cruz, Dennis, Rieger, Alexandre, Salvador, Mirian, Prá, Daniel, and Rech Franke, Silvia Isabel
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- 2022
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235. Gender and Context-Specific Effects of Vocal Dominance and Trustworthiness on Leadership Decisions
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Schild, Christoph, Braunsdorf, Elisa, Steffens, Katharina, Pott, Franka, and Stern, Julia
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- 2022
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236. Historical genetic diversity and population structure of wild red pandas (Ailurus fulgens) in Nepal
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Dueck, Lucy A. and Steffens, Erik A.
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- 2022
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237. Using Utilitarian Plants for Lemur Conservation
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Konersmann, Cathlin, Noromiarilanto, Fanambinantsoa, Ratovonamana, Yedidya R., Brinkmann, Katja, Jensen, Kai, Kobbe, Susanne, Köhl, Michael, Kuebler, Daniel, Lahann, Petra, Steffens, Kim J. E., and Ganzhorn, Jörg U.
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- 2022
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238. GPR55 in B cells limits atherosclerosis development and regulates plasma cell maturation
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Guillamat-Prats, Raquel, Hering, Daniel, Derle, Abhishek, Rami, Martina, Härdtner, Carmen, Santovito, Donato, Rinne, Petteri, Bindila, Laura, Hristov, Michael, Pagano, Sabrina, Vuilleumier, Nicolas, Schmid, Sofie, Janjic, Aleksandar, Enard, Wolfgang, Weber, Christian, Maegdefessel, Lars, Faussner, Alexander, Hilgendorf, Ingo, and Steffens, Sabine
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- 2022
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239. Adult human kidney organoids originate from CD24+ cells and represent an advanced model for adult polycystic kidney disease
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Xu, Yaoxian, Kuppe, Christoph, Perales-Patón, Javier, Hayat, Sikander, Kranz, Jennifer, Abdallah, Ali T., Nagai, James, Li, Zhijian, Peisker, Fabian, Saritas, Turgay, Halder, Maurice, Menzel, Sylvia, Hoeft, Konrad, Kenter, Annegien, Kim, Hyojin, van Roeyen, Claudia R. C., Lehrke, Michael, Moellmann, Julia, Speer, Thimoteus, Buhl, Eva M., Hoogenboezem, Remco, Boor, Peter, Jansen, Jitske, Knopp, Cordula, Kurth, Ingo, Smeets, Bart, Bindels, Eric, Reinders, Marlies E. J., Baan, Carla, Gribnau, Joost, Hoorn, Ewout J., Steffens, Joachim, Huber, Tobias B., Costa, Ivan, Floege, Jürgen, Schneider, Rebekka K., Saez-Rodriguez, Julio, Freedman, Benjamin S., and Kramann, Rafael
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- 2022
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240. Work: saviour or struggle? A qualitative study examining employment and finances in colorectal cancer survivors living with advanced cancer
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Lim, Chloe Yi Shing, Laidsaar-Powell, Rebekah C., Young, Jane M., Steffens, Daniel, Koczwara, Bogda, Zhang, Yuehan, and Butow, Phyllis
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- 2022
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241. Energy Practices and Mindfulness Meditation
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Anālayo, Bhikkhu, Steffens-Dhaussy, Christiane, Gallo, Fred, and Scott, Dawn
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- 2022
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242. 3D Ultrasound Mosaic of the Whole Shoulder: A Feasibility Study
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Ahmed Sewify, Maria Antico, Marian Steffens, Jacqueline Roots, Ashish Gupta, Kenneth Cutbush, Peter Pivonka, and Davide Fontanarosa
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ultrasound shoulder mosaic ,ultrasound shoulder atlas ,shoulder tomography ,3D ultrasound panorama ,machine learning ,3D image registration ,Technology ,Engineering (General). Civil engineering (General) ,TA1-2040 ,Biology (General) ,QH301-705.5 ,Physics ,QC1-999 ,Chemistry ,QD1-999 - Abstract
A protocol is proposed to acquire a tomographic ultrasound (US) scan of the musculoskeletal (MSK) anatomy in the rotator cuff region. Current clinical US imaging techniques are hindered by occlusions and a narrow field of view and require expert acquisition and interpretation. There is limited literature on 3D US image registration of the shoulder or volumetric reconstruction of the full shoulder complex. We believe that a clinically accurate US volume reconstruction of the entire shoulder can aid in pre-operative surgical planning and reduce the complexity of US interpretation. The protocol was used in generating data for deep learning model training to automatically register US mosaics in real-time. An in vivo 3D US tomographic reconstruction of the entire rotator cuff region was produced by registering 53 sequential 3D US volumes acquired by an MSK sonographer. Anatomical surface thicknesses and distances in the US mosaic were compared to their corresponding MRI measurements as the ground truth. The humeral head surface was marginally thicker in the reconstructed US mosaic than its original thickness observed in a single US volume by 0.65 mm. The humeral head diameter and acromiohumeral distance (ACHD) matched with their measured MRI distances with a reconstruction error of 0 mm and 1.2 mm, respectively. Furthermore, the demonstration of 20 relevant MSK structures was independently graded between 1 and 5 by two sonographers, with higher grades indicating poorer demonstration. The average demonstration grade for each anatomy was as follows: bones = 2, muscles = 3, tendons = 3, ligaments = 4–5 and labrum = 4–5. There was a substantial agreement between sonographers (Cohen’s Weighted kappa of 0.71) on the demonstration of the structures, and they both independently deemed the mosaic clinically acceptable for the visualisation of the bony anatomy. Ligaments and the labrum were poorly observed due to anatomy size, location and inaccessibility in a static scan, and artefact build-up from the registration and compounding approaches.
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- 2024
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243. Eine unerwartete Entdeckung bei einer Patientin mit chronischer Prurigo
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Steffens, Elisabeth, Kaplan, Mustafa, and Weisshaar, Elke
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- 2023
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244. Een veilige basis voor alle kinderen
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Steffens, Weija
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- 2023
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245. A soil carbon sequestration bible: Review of “Understanding and fostering soil carbon sequestration” edited by Cornelia Rumpel, Burleigh Dodds Series in Agricultural Science, 2023
- Author
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Bünemann, Else K. and Steffens, Markus
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- 2023
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246. Development of dry-cured pork sausage with sodium nitrite and nitrate microencapsulates: Physicochemical properties, mathematical modeling, sensory, and microbiological analysis
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Karine Cence, Marilia Jordana Dequi Vendruscolo, Leonardo Meirelles da Silva, Rosicler Colet, Alexander Junges, Clarice Steffens, Jamile Zeni, and Eunice Valduga
- Subjects
Meat product ,Curing salts ,Microencapsulation ,Controlled release ,Physicochemical properties ,Food processing and manufacture ,TP368-456 - Abstract
The present study aimed to apply sodium nitrite and nitrate encapsulated in dry-cured pork sausage and evaluate the product quality during storage. The capsules with sodium nitrite and nitrate showed low moisture (3.0%) and water activity (0.382), being within the acceptable index for application in food. The capsules presented spherical microparticles with an average size of 4.44 µm. The application of microcapsules in the dry-cured pork sausage formulation (F2) had a positive effect on the physicochemical and sensory characteristics, with an acceptability of 80% compared to the formulation without encapsulation (F1). The F2 with encapsulated sodium nitrite and nitrate maintained higher concentration of sodium nitrite (78%) than the F1 after 120 days' of storage. In this way, improved the conservation showing lipid oxidation (0.218 mg malondialdehyde/kg). As a result, microencapsulation is a new technology for preserving the preservative concentrations of these salts, ensuring oxidative stability, color, and sensory characteristics during dry-cured pork sausage storage.
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- 2023
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247. How do immunocompromised people experience the changes in their working lives during the COVID-19 pandemic? Results from a mixed-methods study in Germany
- Author
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Greta S. Wegener, Eva Hummers, Frank Müller, Dominik Schröder, Sascha Roder, Alexandra Dopfer-Jablonka, Georg M.N. Behrens, Sandra Steffens, and Tim Schmachtenberg
- Subjects
Immunosuppression ,COVID-19 pandemic ,Social participation ,Work ,Mixed methods study ,Qualitative interviews ,Science (General) ,Q1-390 ,Social sciences (General) ,H1-99 - Abstract
Background and aims: The COVID-19 pandemic has a major impact on many areas of life, including many people's job situations. Not everyone is affected in the same way - people with chronic conditions may experience increased mental stress and social problems. In this study, we focus on immunocompromised people (ICP), who are at high risk for a severe course of COVID-19. Our aim was to investigate the level of social participation during the pandemic, focusing on how ICPs perceive changes in their working lives. Methods: We applied a mixed-methods concurrent triangulation design with qualitative interviews (N = 13) and a quantitative cross-sectional survey with N = 179 participants. This approach allowed us to gain deep insights into the experience of occupational-social participation. Results: Qualitative results show that working from home during the COVID-19 pandemic was seen as a relief by many, as medical necessities could be integrated more easily into everyday life. Understanding and consideration of their professional social network were essential for all respondents. Our interview data hint at an influence of the family situation (e.g., having children) and the relationship of the ICP to coworkers on the perception of changes to their work environment. The quantitative results indicate an interaction between mental health and employment status on social participation, with employment reducing the negative impact of poorer mental health on social participation after adjusting for sociodemographic variables. Conclusions: Our results indicate changes necessary to integrate people with chronic conditions into working life, even under pandemic conditions. This includes the possibility of flexible working hours and compliance with hygiene measures at the workplace.
- Published
- 2023
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248. Subcritical crack growth models for SiC fiber in air and steam: Low temperature data and possible effects of residual stress
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Randall S. Hay, Marina Ruggles-Wrenn, Scott J. Robertson, Benjamin R. Steffens, Matthew W. Piper, Theodore R. Shillig, Ronald K. Mitchell, Brian M. Kroeger, Logan M. Gumucio, Caleigh M. Nelson, and Richard J. Reinink
- Subjects
Clay industries. Ceramics. Glass ,TP785-869 - Abstract
Failure times (tf) and brittle creep strain rates (ἑ) for static fatigue of Hi-Nicalon™-S fiber tows were measured at 500 and 600 °C. These measurements added to those done previously at 700–1100 °C. Subcritical crack growth (SCG) based models developed to predict tf and ἑ from the 700–1100 °C data were modified to include the additional data. Parameters for two SCG laws were determined for air and Si(OH)4 saturated steam environments, and an additional parameter for effective room-temperature residual stress (σRo) along the crack path was introduced. Tow failure was modelled as sequential filament failure by SCG from weakest to strongest in a Weibull distribution. The increase in stress on intact filaments as they oxidized and as other filaments failed caused brittle creep strain. SCG-based models for both surface and interior cracks were considered. Orthogonal direction regression (ODR) was used to find the best parameter fits to data. Faster numerical methods to find the global parameter-space minima and avoid local minima were developed. New model parameters were determined using the entire 500–1100 °C tf and ἑ data set, done at initial applied stresses from 260 to 1526 MPa. In air, measured tf and ἑ at 500 and 600 °C follow the trends previously observed for higher temperatures. However, beneath 700 °C in steam, tf are longer and ἑ are much slower than expected. They are similar to values measured for air, suggesting an SCG mechanism change between 700° and 600 °C in steam. An atomistic SCG law-based model with activation energy (Q) of 310 kJ/mol and σRo of ∼200 MPa compression is suggested to be appropriate for static fatigue in air. An atomistic SCG law-based model with Q of 360 kJ/mol and σRo of ∼0 MPa best fit data measured in steam. However, differences in data fit quality between models were small, so firm conclusions about the correct model, residual stress effects, and associated crack paths could not be made. As stress approaches zero, the model converges to tow failure times that are the times for complete fiber oxidation. As failure times approach zero and temperatures decrease, the model converges to tow strengths predicted by fiber bundle theory at room temperature. The sources of error in data fit, the merit of different SCG models, and the possible roles of residual stress in SCG for Hi-Nicalon™-S fibers are discussed.
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- 2023
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249. LONG TERM EVALUATION OF TURP IN MEN WITH DETRUSOR UNDERACTIVITY OR ACONTRACTILE DETRUSOR: A PROSPECTIVE CROSS-SECTIONAL STUDY WITH PATIENT REPORTED OUTCOMES.
- Author
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N Merode van, E Meer ter, M Steffens, and L Witte
- Subjects
Diseases of the genitourinary system. Urology ,RC870-923 - Published
- 2023
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250. EFFECT OF BLADDER OUTLET PROCEDURES ON URODYNAMIC ASSESSMENTS IN MEN WITH AN ACONTRACTILE OR UNDERACTIVE DETRUSOR: A SYSTEMATIC REVIEW AND META-ANALYSIS
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N Merode van, I Nijholt, J Heesakkers, G Koeveringe, M Steffens, and L Witte
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Diseases of the genitourinary system. Urology ,RC870-923 - Published
- 2023
- Full Text
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