37 results on '"Naslund, J"'
Search Results
2. Scaling Up Maternal Mental healthcare by Increasing access to Treatment (SUMMIT) through non-specialist providers and telemedicine: a study protocol for a non-inferiority randomized controlled trial
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Singla, D. R., Meltzer-Brody, S. E., Silver, R. K., Vigod, S. N., Kim, J. J., La Porte, L. M., Ravitz, P., Schiller, C. E., Schoueri-Mychasiw, N., Hollon, S. D., Kiss, A., Clark, D., Dalfen, A. K., Dimidjian, S., Gaynes, B. N., Katz, S. R., Lawson, A., Leszcz, M., Maunder, R. G., Mulsant, B. H., Murphy, K. E., Naslund, J. A., Reyes-Rodríguez, M. L., Stuebe, A. M., Dennis, C-L, and Patel, V.
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- 2021
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3. The impact of social drivers, conditional cash transfers and their mechanisms on the mental health of the young; an integrated retrospective and forecasting approach using the 100 million Brazilian Cohort: A study protocol
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Carels, V, Machado, DB, Paiva de Araujo, JA, Oliveira Alves, FJ, Silva Castro-de-Araujo, LF, Rodrigues, EDS, Morais Xavier, EF, Rodrigues, RL, Rasella, D, Naslund, J, Patel, V, Barreto, ML, Carels, V, Machado, DB, Paiva de Araujo, JA, Oliveira Alves, FJ, Silva Castro-de-Araujo, LF, Rodrigues, EDS, Morais Xavier, EF, Rodrigues, RL, Rasella, D, Naslund, J, Patel, V, and Barreto, ML
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BACKGROUND: Physical, emotional, and social changes, including exposure to poverty, abuse, or violence, increases youth vulnerability to mental illness. These factors interfere with development, limit opportunities, and hamper achievement of a fulfilling life as adults. Addressing these issues can lead to improved outcomes at the population level and better cost-effectiveness for health services. Cash transfer programs have been a promising way to address social drivers for poor mental health. However, it is still unclear which pathways and mechanisms explain the association between socioeconomic support and lower mental illness among youth. Therefore, we will evaluate the effect of social drivers on youth mental health-related hospitalizations and suicide, test mechanisms and pathways of a countrywide socioeconomic intervention, and examine the timing of the intervention during the life course. METHODS: We will combine individual-level data from youth national hospitalization, mental health disorders and attempted suicide, suicide registries and notifications of violence, with large-scale databases, including "The 100 Million Brazilian Cohort", over an 18-year period (2001-2018). Several approaches will be used for the retrospective quasi-experimental impact evaluations, such as Regression Discontinuity Designs, Propensity Score Matching and difference-in-differences, combined with multivariable regressions for cohort analyses. We will run multivariate regressions based on hierarchical analysis approach to evaluate the association between important social drivers (mental health care, demographic and economic aspects) on mental health-related hospitalizations and suicide among youth. Furthermore, we will perform microsimulations to generate projections regarding how mental health-related hospitalizations and suicide trends will be in the future based on the current state, and how BFP implementation scenarios will affect these trends. DISCUSSION: The results of this
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- 2022
4. Effectiveness of Group Problem Management Plus, a brief psychological intervention for adults affected by humanitarian disasters in Nepal: A cluster randomized controlled trial
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Naslund, J, Jordans, MJD, Kohrt, BA, Sangraula, M, Turner, EL, Wang, X, Shrestha, P, Ghimire, R, Van't Hof, E, Bryant, RA, Dawson, KS, Marahatta, K, Luitel, NP, van Ommeren, M, Naslund, J, Jordans, MJD, Kohrt, BA, Sangraula, M, Turner, EL, Wang, X, Shrestha, P, Ghimire, R, Van't Hof, E, Bryant, RA, Dawson, KS, Marahatta, K, Luitel, NP, and van Ommeren, M
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BACKGROUND: Globally, 235 million people are impacted by humanitarian emergencies worldwide, presenting increased risk of experiencing a mental disorder. Our objective was to test the effectiveness of a brief group psychological treatment delivered by trained facilitators without prior professional mental health training in a disaster-prone setting. METHODS AND FINDINGS: We conducted a cluster randomized controlled trial (cRCT) from November 25, 2018 through September 30, 2019. Participants in both arms were assessed at baseline, midline (7 weeks post-baseline, which was approximately 1 week after treatment in the experimental arm), and endline (20 weeks post-baseline, which was approximately 3 months posttreatment). The intervention was Group Problem Management Plus (PM+), a psychological treatment of 5 weekly sessions, which was compared with enhanced usual care (EUC) consisting of a family psychoeducation meeting with a referral option to primary care providers trained in mental healthcare. The setting was 72 wards (geographic unit of clustering) in eastern Nepal, with 1 PM+ group per ward in the treatment arm. Wards were eligible if they were in disaster-prone regions and residents spoke Nepali. Wards were assigned to study arms based on covariate constrained randomization. Eligible participants were adult women and men 18 years of age and older who met screening criteria for psychological distress and functional impairment. Outcomes were measured at the participant level, with assessors blinded to group assignment. The primary outcome was psychological distress assessed with the General Health Questionnaire (GHQ-12). Secondary outcomes included depression symptoms, posttraumatic stress disorder (PTSD) symptoms, "heart-mind" problems, social support, somatic symptoms, and functional impairment. The hypothesized mediator was skill use aligned with the treatment's mechanisms of action. A total of 324 participants were enrolled in the control arm (36 wards) and 319
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- 2021
5. Increase in pollen sensitization in Swedish adults and protective effect of keeping animals in childhood
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Bjerg, A., Ekerljung, L., Eriksson, J., Naslund, J., Sjölander, S., Rönmark, E., Dahl, Å., Holmberg, K., Wennergren, G., Torén, K., Borres, Magnus P., Lötvall, J., Lundbäck, B., Bjerg, A., Ekerljung, L., Eriksson, J., Naslund, J., Sjölander, S., Rönmark, E., Dahl, Å., Holmberg, K., Wennergren, G., Torén, K., Borres, Magnus P., Lötvall, J., and Lundbäck, B.
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Background To date, most studies of the 'allergy epidemic' have been based on self-reported data. There is still limited knowledge on time trends in allergic sensitization, especially among adults. Objective To study allergic sensitization, its risk factors and time trends in prevalence. Methods Within West Sweden Asthma Study (WSAS), a population-based sample of 788 adults (17-60 years) underwent skin prick tests (SPTs) for 11 aeroallergens 2009-2012. Specific IgE was analysed in 750 of the participants. Those aged 20-46 years (n = 379) were compared with the European Community Respiratory Health Survey sample aged 20-46 year from the same area (n = 591) in 1991-1992. Results Among those aged 20-46 years, the prevalence of positive SPT to pollen increased, timothy from 17.1% to 29.0% (P < 0.001) and birch from 15.6% to 23.7% (P = 0.002) between 1991-1992 and 2009-2012. Measurements of specific IgE confirmed these increases. Prevalence of sensitization to all other tested allergens was unchanged. In the full WSAS sample aged 17-60 years, any positive SPT was seen in 41.9%, and the dominating sensitizers were pollen (34.3%), animals (22.8%) and mites (12.6%). Pollen sensitization was strongly associated with rhinitis, whereas indoor allergens were more associated with asthma. Growing up with livestock or furred pets decreased the risk of sensitization, adjusted odds ratio 0.53 (0.28-0.995) and 0.68 (0.47-0.98), respectively. Conclusion Pollen sensitization has increased in Swedish adults since the early 1990s, while the prevalence of sensitization to other allergens has remained unchanged. This is one plausible explanation for the increase in rhinitis 1990-2008 in Swedish adults, during which time the prevalence of asthma, which is more associated with perennial allergens, was stable. Contact with animals in childhood seems to reduce the risk of sensitization well into adulthood. One major factor contributing to the rise in pollen allergy is a significant increase
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- 2016
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6. The future of mental health care: peer-to-peer support and social media
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Naslund, J. A., primary, Aschbrenner, K. A., additional, Marsch, L. A., additional, and Bartels, S. J., additional
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- 2016
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7. Linking lab activity with growth and movement in the wild: explaining pace-of-life in a trout stream
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Zavorka, L., primary, Aldven, D., additional, Naslund, J., additional, Hojesjo, J., additional, and Johnsson, J. I., additional
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- 2015
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8. Francisella tularensis Subspecies holarctica Occurs in Swedish Mosquitoes, Persists Through the Developmental Stages of Laboratory-Infected Mosquitoes and Is Transmissible During Blood Feeding
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Thelaus, J., Andersson, A., Broman, T., Backman, S., Granberg, M., Karlsson, L., Kuoppa, K., Larsson, E., Lundmark, E., Lundström, Jan O., Mathisen, P., Naslund, J., Schäfer, M., Wahab, T., Forsman, M., Thelaus, J., Andersson, A., Broman, T., Backman, S., Granberg, M., Karlsson, L., Kuoppa, K., Larsson, E., Lundmark, E., Lundström, Jan O., Mathisen, P., Naslund, J., Schäfer, M., Wahab, T., and Forsman, M.
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In Sweden, mosquitoes are considered the major vectors of the bacterium Francisella tularensis subsp. holarctica, which causes tularaemia. The aim of this study was to investigate whether mosquitoes acquire the bacterium as aquatic larvae and transmit the disease as adults. Mosquitoes sampled in a Swedish area where tularaemia is endemic (A-rebro) were positive for the presence of F. tularensis deoxyribonucleic acid throughout the summer. Presence of the clinically relevant F. tularensis subsp. holarctica was confirmed in 11 out of the 14 mosquito species sampled. Experiments performed using laboratory-reared Aedes aegypti confirmed that F. tularensis subsp. holarctica was transstadially maintained from orally infected larvae to adult mosquitoes and that 25 % of the adults exposed as larvae were positive for the presence of F. tularensis-specific sequences for at least 2 weeks. In addition, we found that F. tularensis subsp. holarctica was transmitted to 58 % of the adult mosquitoes feeding on diseased mice. In a small-scale in vivo transmission experiment with F. tularensis subsp. holarctica-positive adult mosquitoes and susceptible mice, none of the animals developed tularaemia. However, we confirmed that there was transmission of the bacterium to blood vials by mosquitoes that had been exposed to the bacterium in the larval stage. Taken together, these results provide evidence that mosquitoes play a role in disease transmission in part of Sweden where tularaemia recurs.
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- 2014
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9. A coupled climate model simulation of Marine Isotope Stage 3 stadial climate
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Brandefelt, Jenny, Kjellstrom, E, Naslund, J O, Strandberg, G, Voelker, A H L, Wohlfarth, B, Brandefelt, Jenny, Kjellstrom, E, Naslund, J O, Strandberg, G, Voelker, A H L, and Wohlfarth, B
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We present a coupled global climate model (CGCM) simulation, integrated for 1500 yr to quasi-equilibrium, of a stadial (cold period) within Marine Isotope Stage 3 (MIS 3). The simulated Greenland stadial 12 (GS12; similar to 44 ka BP) annual global mean surface temperature (T-s) is 5.5 degrees C lower than in the simulated recent past (RP) climate and 1.3 degrees C higher than in the simulated Last Glacial Maximum (LGM; 21 ka BP) climate. The simulated GS12 is evaluated against proxy data and previous modelling studies of MIS3 stadial climate. We show that the simulated MIS 3 climate, and hence conclusions drawn regarding the dynamics of this climate, is highly model-dependent. The main findings are: (i) Proxy sea surface temperatures (SSTs) are higher than simulated SSTs in the central North Atlantic, in contrast to earlier simulations of MIS 3 stadial climate in which proxy SSTs were found to be lower than simulated SST. (ii) The Atlantic Meridional Overturning Circulation (AMOC) slows down by 50% in the GS12 climate as compared to the RP climate. This slowdown is attained without freshwater forcing in the North Atlantic region, a method used in other studies to force an AMOC shutdown. (iii) El-Nino-Southern Oscillation (ENSO) teleconnections in mean sea level pressure (MSLP) are significantly modified by GS12 and LGM forcing and boundary conditions. (iv) Both the mean state and variability of the simulated GS12 is dependent on the equilibration. The annual global mean T-s only changes by 0.10 degrees C from model years 500-599 to the last century of the simulation, indicating that the climate system may be close to equilibrium already after 500 yr of integration. However, significant regional differences between the last century of the simulation and model years 500-599 exist. Further, the difference between simulated and proxy SST is reduced from model years 500-599 to the last century of the simulation. The results of the ENSO variability analysis is also shown, QC 20110720
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- 2011
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10. Decreased pulsatile blood flow in the patella in patellofemoral pain syndrome
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Naslund, J., Walden, M., Lindberg, Lars-Göran, Naslund, J., Walden, M., and Lindberg, Lars-Göran
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Background: Anterior knee pain without clinical and radiologic abnormalities has primarily been explained from a purely structural view. A recently proposed biologic and homeostatic explanation questions the malalignment theory. No objective measurement of the pathophysiology responsible for changes in local homeostasis has been presented. Hypothesis: Flexing the knee joint interferes with the perfusion of the patellar bone in patellofemoral pain syndrome. Study Design: Case control study, Level of evidence, 4. Methods: Pulsatile blood flow in the patella was measured continuously and noninvasively using photoplethysmography. Measurements were made with the patient in a resting position with knee flexion of 20°and after passive knee flexion to 90°. In total, 22 patients with patellofemoral pain syndrome were examined bilaterally, and 33 subjects with healthy knees served as controls. Results: The pulsatile blood flow in the patient group decreased after passive knee flexion from 20°to 90°(systematic change in position, or relative position [RP] = -0.32, 95% confidence interval for RP, -0.48 to -0.17), while the response in the control group showed no distinct pattern (RP = 0.17, 95% confidence interval for RP, -0.05 to 0.31). The difference between the groups was significant (P =.0002). The median change in patients was -26% (interquartile range, 37). Conclusions: Pulsatile patellar blood flow in patellofemoral pain syndrome patients is markedly reduced when the knee is being flexed, which supports the previous notion of an ischemic mechanism involved in the pathogenesis of this pain syndrome. © 2007 American Orthopaedic Society for Sports Medicine.
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- 2007
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11. Non-invasive continuous estimation of blood flow changes in human patellar bone
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Naslund, J., Pettersson, Jonas, Lundeberg, T., Linnarsson, D., Lindberg, Lars-Göran, Naslund, J., Pettersson, Jonas, Lundeberg, T., Linnarsson, D., and Lindberg, Lars-Göran
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A photoplethysmographic (PPG) technique to assess blood flow in bone tissue has been developed and tested. The signal detected by the PPG consists of a constant-level (DC) component - which is related to the relative vascularization of the tissue - and a pulsatile (AC) component - which is synchronous with the pumping action of the heart. The PPG probe was applied on the skin over the patella. The probe uses near-infrared (804 nm) and green (560 nm) light sources and the AC component of the PPG signals of the two wavelengths was used to monitor pulsatile blood flow in the patellar bone and the overlying skin, respectively. Twenty healthy subjects were studied and arterial occlusion resulted in elimination of PPG signals at both wavelengths, whereas occlusion of skin blood flow by local surface pressure eliminated only the PPG signal at 560 nm. In a parallel study on a physical model with a rigid tube we showed that the AC component of the PPG signal originates from pulsations of blood flow in a rigid structure and not necessarily from volume pulsations. We conclude that pulsatile blood flow in the patellar bone can be assessed with the present PPG technique. © International Federation for Medical and Biological Engineering 2006.
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- 2006
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12. Pen-2 Is Sequestered in the Endoplasmic Reticulum and Subjected toUbiquitylation and Proteasome-mediated Degradation in the Absence ofPresenilin.
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Bergman, A, Hansson, EM, Pursglove, SE, Farmery, MR, Lannfelt, L, Lendahl, U, Lundkvist, J, Naslund, J, Bergman, A, Hansson, EM, Pursglove, SE, Farmery, MR, Lannfelt, L, Lendahl, U, Lundkvist, J, and Naslund, J
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- 2004
13. APP intracellular domain formation and unaltered signaling in the presenceof familial Alzheimer's disease mutations.
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Bergman, A, Religa, D, Karlstrom, H, Laudon, H, Winblad, B, Lannfelt, L, Lundkvist, J, Naslund, J, Bergman, A, Religa, D, Karlstrom, H, Laudon, H, Winblad, B, Lannfelt, L, Lundkvist, J, and Naslund, J
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- 2003
14. The Arctic mutation interferes with processing of the amyloid precursorprotein.
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Stenh, C, Nilsberth, C, Hammarback, J, Engvall, B, Naslund, J, Lannfelt, L, Stenh, C, Nilsberth, C, Hammarback, J, Engvall, B, Naslund, J, and Lannfelt, L
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- 2002
15. A computer-based training system for breast fine needle aspiration cytology
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Peng, S., Westermark, Gunilla, Naslund, J., Häggqvist, Bo, Glennert, J., Westermark, P., Peng, S., Westermark, Gunilla, Naslund, J., Häggqvist, Bo, Glennert, J., and Westermark, P.
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Fine-needle aspiration (FNA) cytology is a rapid and inexpensive technique used extensively in the diagnosis of breast disease. To remove diagnostic subjectivity, a diagnostic decision support system (DDSS) called CytoInform© has been developed, based on a Bayesian belief network (BBN) for the diagnosis of breast FNAs. In addition to acting as a DDSS, the system implements a computer-based training (CBT) system, providing a novel approach to breast cytology training. The system guides the trainee cytopathologist through the diagnostic process, allowing the user to grade each diagnostic feature using a set of on-screen reference images as visual clues. The trainee positions a slider on a spectrum relative to these images, reflecting the similarity between the reference image and the microscope image. From this, an evidence vector is generated, allowing the current diagnostic probability to be updated by the BBN. As the trainee assesses each clue, the evidence entered is compared with that of the expert through the use of a defined teaching file. This file records the relative severity of each clue and a tolerance band within which the trainee must position the slider. When all clues in the teaching case have been completed, the system informs the user of inaccuracies and offers the ability to reassess problematic features. In trials with two pathologists of different experience and a series of ten cases, the system provided an effective tool in conveying diagnostic evidence and protocols to trainees. This is evident from the fact that each pathologist only misinterpreted one case and a total of 86%/88% (experienced/inexperienced) of all clues assessed were interpreted correctly. Significantly, in all cases that produced the correct final diagnostic probability, the route taken to that solution was consistent with the expert's solution. Copyright © 2001 John Wiley & Sons, Ltd.
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- 2002
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16. Structure of the dimethyl sulfoxide solvated thallium(III) ion in solution and in the solid state
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Ma, G. B., Molla-Abbassi, A., Kritikos, M., Ilyukhin, A., Jalilehvand, F., Kessler, V., Skripkin, M., Sandstrom, M., Glaser, Julius, Naslund, J., Persson, I., Ma, G. B., Molla-Abbassi, A., Kritikos, M., Ilyukhin, A., Jalilehvand, F., Kessler, V., Skripkin, M., Sandstrom, M., Glaser, Julius, Naslund, J., and Persson, I.
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The structure and vibrational spectra of the dimethyl sulfoxide solvated thallium(III) ion have been studied in a dimethyl sulfoxide solution and in the solid state. X-ray crystallography shows a trigonal unit cell, space group R (3) over bar (No. 148), for the [TI(dmso)(6)](ClO4)(3) Compound with Z = 3, a = b = 11.9764(13) [11.8995(9)] Angstrom, c = 20.802(2) [20.467(2)] Angstrom, and V = 2584.0(5) [2509.9(4)] Angstrom (3) at 295 [150] K. The crystal structure comprises a highly symmetric hexakis(dimethyl sulfoxide)thallium(III) ion, with thallium in a 3 symmetry site and a TI-O bond distance of 2.224(3) Angstrom at 295 K. The octahedral TlO6 kernel is compressed along the threefold axis with an O-Tl-O bond angle of 96.20(11)degrees. The Tl-O-S bond angle of 120.7(2)degrees corresponds to a Tl . . .S distance of 3.292(2) Angstrom. One perchlorate ion centered on the (3) over bar axis was described by a statistically disordered model. A low-temperature EXAFS study (10 K) resulted in the TI-O and Tl . . .S distances of 2.221(4) and 3.282(6) Angstrom, respectively, consistent with a Tl-O-S bond angle of 120(1)degrees. The low Debye-Waller factors confirm a regular coordination without the disorder of the dimethyl sulfoxide ligands, which would have resulted from the alternative choice of space group R3 for the crystal structure. Raman and infrared spectra have been recorded and assigned, with the bands at 435 and 447 cm(-1) corresponding to the vibrational frequency of the symmetric and asymmetric TI-O stretching modes, respectively. EXAFS data of a 0.5 mol dm(-3) thallium(III) trifluoromethanesulfonate in a dimethyl sulfoxide solution were consistent with that of a hexasolvated ion with mean Tl-O and Tl . . .S distances of 2.22(1) and 3.33(2) Angstrom, respectively, which correspond to a mean Tl-O-S bond angle of 124(2)degrees. The anomalously large disorder parameter for the TI-O distances is consistent with a weal, pseudo-Jahn-Teller effect. The Tl-205, C-13, and H, QC 20100525
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- 2001
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17. BEDMAP: A new ice thickness and subglacial topographic model of Antarctica
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Lythe, Matthew, Vaughan, David G., Lambrecht, A., Miller, H., Nixdorf, U., Oerter, H., Steinhage, D., Allison, I.F., Craven, M., Goodwin, I.D., Jacka, J., Morgan, V., Ruddell, A., Young, N., Wellman, P., Cooper, A.P.R., Corr, H.F.J., Doake, C.S.M., Hindmarsh, R.C.A., Jenkins, A., Johnson, M.R., Jones, P., King, E.C., Smith, A.M., Thomson, J.W., Thorley, M.R., Jezek, K., Li, B., Liu, H., Damm, V., Nishio, F., Fujita, S., Skvarca, P., Remy, F., Testut, L., Sievers, J., Kapitsa, A., Macheret, Y., Scambos, T., Filina, I., Masolov, V., Popov, S., Johnstone, G., Jacobel, B., Holmlund, P., Naslund, J., Anandakrishnan, S., Bamber, J.L., Bassford, R., Decleir, H., Huybrechts, P., Rivera, A., Grace, N., Casassa, G., Tabacco, I., Blankenship, D., Morse, D., Gades, T., Nereson, N., Bentley, C.R., Lord, N., Lange, M., Sandhäger, H., Lythe, Matthew, Vaughan, David G., Lambrecht, A., Miller, H., Nixdorf, U., Oerter, H., Steinhage, D., Allison, I.F., Craven, M., Goodwin, I.D., Jacka, J., Morgan, V., Ruddell, A., Young, N., Wellman, P., Cooper, A.P.R., Corr, H.F.J., Doake, C.S.M., Hindmarsh, R.C.A., Jenkins, A., Johnson, M.R., Jones, P., King, E.C., Smith, A.M., Thomson, J.W., Thorley, M.R., Jezek, K., Li, B., Liu, H., Damm, V., Nishio, F., Fujita, S., Skvarca, P., Remy, F., Testut, L., Sievers, J., Kapitsa, A., Macheret, Y., Scambos, T., Filina, I., Masolov, V., Popov, S., Johnstone, G., Jacobel, B., Holmlund, P., Naslund, J., Anandakrishnan, S., Bamber, J.L., Bassford, R., Decleir, H., Huybrechts, P., Rivera, A., Grace, N., Casassa, G., Tabacco, I., Blankenship, D., Morse, D., Gades, T., Nereson, N., Bentley, C.R., Lord, N., Lange, M., and Sandhäger, H.
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Measurements of ice thickness on the Antarctic ice sheet collected during surveys undertaken over the past 50 years have been brought together into a single database. From these data, a seamless suite of digital topographic models have been compiled for Antarctica and its surrounding ocean. This includes grids of ice sheet thickness over the grounded ice sheet and ice shelves, water column thickness beneath the floating ice shelves, bed elevation beneath the grounded ice sheet, and bathymetry to 60°S, including the sub-ice-shelf cavities. These grids are consistent with a recent high-resolution surface elevation model of Antarctica. While the digital models have a nominal spatial resolution of 5 km, such high resolution is justified by the original data density only over a few parts of the ice sheet. The suite does, however, provide an unparalleled vision of the geosphere beneath the ice sheet and a more reliable basis for ice sheet modeling than earlier maps. The total volume of the Antarctic ice sheet calculated from the BEDMAP grid is 25.4 million km3, and the total sea level equivalent, derived from the amount of ice contained within the grounded ice sheet, is 57 m, comprising 52 m from the East Antarctic ice sheet and 5 m from the West Antarctic ice sheet, slightly less than earlier estimates. The gridded data sets can be obtained from the authors.
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- 2001
18. Commentary on "Acute patellofemoral pain: aggravating activities, clinical examination, MRI and ultrasound findings"
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Naslund, J. E, primary
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- 2007
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19. Medin: an integral fragment of aortic smooth muscle cell-produced lactadherin forms the most common human amyloid.
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Haggqvist, B, Naslund, J, Sletten, K, Westermark, GT, Mucchiano, G, Tjernberg, LO, Nordstedt, C, Engstrom, U, Westermark, P, Haggqvist, B, Naslund, J, Sletten, K, Westermark, GT, Mucchiano, G, Tjernberg, LO, Nordstedt, C, Engstrom, U, and Westermark, P
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- 1999
20. Amyloid protein in aortic media is partly characterized
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Häggqvist, B, Mucchiano, G, Sletten, K, Naslund, J, Westermark, P, Häggqvist, B, Mucchiano, G, Sletten, K, Naslund, J, and Westermark, P
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- 1999
21. Estrogen reduces neuronal generation of Alzheimer beta-amyloid peptides
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Xu, H.X., Gouras, G.K., Greenfield, J.P., Vincent, B., Naslund, J., Mazzarelli, L., Fried, G., Jovanovic, J.N., Seeger, M., Relkin, N.R., Liao, F., Checler, F., Buxbaum, J.D., Chait, B.T., Thinakaran, G., Sisodia, S.S., Wang, R., Greengard, P., Gandy, S., Xu, H.X., Gouras, G.K., Greenfield, J.P., Vincent, B., Naslund, J., Mazzarelli, L., Fried, G., Jovanovic, J.N., Seeger, M., Relkin, N.R., Liao, F., Checler, F., Buxbaum, J.D., Chait, B.T., Thinakaran, G., Sisodia, S.S., Wang, R., Greengard, P., and Gandy, S.
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Alzheimer's disease (AD) is characterized by the accumulation of cerebral plaques composed of 40- and 42-amino acid beta-amyloid (A beta) peptides, and autosomal dominant forms of AD appear to cause disease by promoting brain A beta accumulation. Recent studies indicate that postmenopausal estrogen replacement therapy may prevent or delay the onset of AD. Here we present evidence that physiological levels of 17 beta-estradiol reduce the generation of A beta by neuroblastoma cells and by primary cultures of rat, mouse and human embryonic cerebrocortical neurons. These results suggest a mechanism by which estrogen replacement therapy can delay or prevent AD.
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- 1998
22. Association Between Care Utilization and Anxiety Outcomes in an On-Demand Mental Health System: Retrospective Observational Study
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Kunkle, Sarah, Yip, Manny, Hunt, Justin, Ξ, Watson, Udall, Dana, Arean, Patricia, Nierenberg, Andrew, and Naslund, John A
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Medicine - Abstract
BackgroundAnxiety is an extremely prevalent condition, and yet, it has received notably less attention than depression and other mental health conditions from a research, clinical, and public health perspective. The COVID-19 pandemic has only exacerbated growing concerns about the burden of anxiety due to the confluence of physical health risks, economic stressors, social isolation, and general disruption of daily activities. ObjectiveThis study examines differences in anxiety outcomes by care modality (coaching, teletherapy and telepsychiatry, and combined care) within an on-demand mental health system. We also explore the association between levels of engagement within each care modality and odds of improvement in symptoms of anxiety. MethodsWe conducted a retrospective observational study of individuals who accessed Ginger, an on-demand mental health system. Data were collected from 1611 Ginger members between January 1, 2018, and December 31, 2019. We used logistic regression to assess the association between care modality and improvement in anxiety symptoms. Within each modality, we assessed the association between level of engagement and improvement. ResultsOf 1611 Ginger members, 761 (47.0%) experienced a decrease in anxiety symptoms, as measured by a change from a positive to a negative 2-item Generalized Anxiety Disorder (GAD-2) screen. Among members who still screened positive at follow-up (865/1611, 53%), a total of 192 members (11.9%) experienced a clinically significant score reduction in the full GAD-7 (ie, a score reduction of >5 points), even though their GAD-2 scores were still positive. All modalities showed increased odds of improvement compared to those who were not engaged with coaching or clinical services (“app-only”). Higher GAD-7 intake scores were also associated with decreased odds of improvement. ConclusionsThis study found increased odds of anxiety improvement for all care modalities compared to those who did not engage in care, with larger effect sizes for higher utilization within all care modalities. Additionally, there is a promising observation that those engaged in combined care (teletherapy and text-based coaching) had the greatest odds of anxiety improvement. Future directions include more detailed classifications of utilization patterns and an exploration of explanations and solutions for lower-utilization members.
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- 2021
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23. SHORT COMMUNICATION. Differences in media access and use between rural Native American and White children.
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Hswen, Y., Naslund, J. A., and Bickham, D. S.
- Abstract
Introduction: Native American children experience greater disparities in the number and magnitude of health-related diseases than White children. Multimedia-based health interventions may afford valuable opportunities for reaching this underserved demographic; however, limited data are available describing the use of media technologies among Native Americans. This study characterized diverse media access and use between rural Native American and White children. Methods: Surveys were administered to students (n =477) aged 10-15 years in grades 6-8 across four public middle schools in the rural Upper Peninsula of the Midwestern USA state of Michigan. Results: Native American children (n =41) were more likely than White children (n =436) to have a video game system in their bedroom (65.9% vs 45.4%; p =0.01) and watch more minutes of television on Saturdays (110.3±91.7 vs 80.7±80.8; p =0.03). Native American children also had fewer computers within the home (1.20±0.81 vs 1.68±1.21; p =0.01) than White children and less household internet access (75.6% vs 87.1%; p =0.04), but demonstrated more use in minutes after school (79.9±97.9 vs 51.1±71.6; p =0.02) and on Saturdays (92.6±107.4 vs 60.0±85.1; p =0.02). Conclusions: This represents the first cross-cultural comparison of media access and use between Native American and White children from rural Michigan. Greater computer and internet use observed among the Native American children surveyed in this study supports the use of web-based public health initiatives aimed at reducing health disparities within this vulnerable group. [ABSTRACT FROM AUTHOR]
- Published
- 2014
24. Digital Peer Support Mental Health Interventions for People With a Lived Experience of a Serious Mental Illness: Systematic Review
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Fortuna, Karen L, Naslund, John A, LaCroix, Jessica M, Bianco, Cynthia L, Brooks, Jessica M, Zisman-Ilani, Yaara, Muralidharan, Anjana, and Deegan, Patricia
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Psychology ,BF1-990 - Abstract
BackgroundPeer support is recognized globally as an essential recovery service for people with mental health conditions. With the influx of digital mental health services changing the way mental health care is delivered, peer supporters are increasingly using technology to deliver peer support. In light of these technological advances, there is a need to review and synthesize the emergent evidence for peer-supported digital health interventions for adults with mental health conditions. ObjectiveThe aim of this study was to identify and review the evidence of digital peer support interventions for people with a lived experience of a serious mental illness. MethodsThis systematic review was conducted using Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) procedures. The PubMed, Embase, Web of Science, Cochrane Central, CINAHL, and PsycINFO databases were searched for peer-reviewed articles published between 1946 and December 2018 that examined digital peer support interventions for people with a lived experience of a serious mental illness. Additional articles were found by searching the reference lists from the 27 articles that met the inclusion criteria and a Google Scholar search in June 2019. Participants, interventions, comparisons, outcomes, and study design (PICOS) criteria were used to assess study eligibility. Two authors independently screened titles and abstracts, and reviewed all full-text articles meeting the inclusion criteria. Discrepancies were discussed and resolved. All included studies were assessed for methodological quality using the Methodological Quality Rating Scale. ResultsA total of 30 studies (11 randomized controlled trials, 2 quasiexperimental, 15 pre-post designs, and 2 qualitative studies) were included that reported on 24 interventions. Most of the studies demonstrated feasibility, acceptability, and preliminary effectiveness of peer-to-peer networks, peer-delivered interventions supported with technology, and use of asynchronous and synchronous technologies. ConclusionsDigital peer support interventions appear to be feasible and acceptable, with strong potential for clinical effectiveness. However, the field is in the early stages of development and requires well-powered efficacy and clinical effectiveness trials. Trial RegistrationPROSPERO CRD42020139037; https://www.crd.york.ac.uk/PROSPERO/display_record.php?RecordID= 139037
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- 2020
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25. Amyloid fibril formation by pulmonary surfactant protein C
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Gustafsson, M., Thyberg, J., Naslund, J., Eliasson, E., and Johansson, J.
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- 1999
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26. Erratum: Scaling up the task-sharing of psychological therapies: A formative study of the PEERS smartphone application for supervision and quality assurance in rural India - CORRIGENDUM.
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Singla DR, Fernandes L, Savel K, Shah A, Agrawal R, Bhan A, Nadkarni A, Sharma A, Khan A, Lahiri A, Tugnawat D, Lesh N, Patel V, and Naslund J
- Abstract
[This corrects the article DOI: 10.1017/gmh.2024.11.]., (© The Author(s) 2024.)
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- 2024
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27. Scaling up the task-sharing of psychological therapies: A formative study of the PEERS smartphone application for supervision and quality assurance in rural India.
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Singla DR, Fernandes L, Savel K, Shah A, Agrawal R, Bhan A, Nadkarni A, Sharma A, Khan A, Lahiri A, Tugnawat D, Lesh N, Naslund J, and Patel V
- Abstract
Measurement-based peer supervision is one strategy to assure the quality of psychological treatments delivered by non-mental health specialist providers. In this formative study, we aimed to 1) describe the development and 2) examine the acceptability and feasibility of PEERS (Promoting Effective mental healthcare through peER Supervision)-a novel smartphone app that aims to facilitate registering and scheduling patients, collecting patient outcomes, rating therapy quality and assessing supervision quality-among frontline treatment providers delivering behavioral activation treatment for depression. The PEERS prototype was developed and tested in 2021, and version 1 was launched in 2022. To date, 215 treatment providers (98% female; ages 30-35) in Madhya Pradesh and Goa, India, have been trained to use PEERS and 65.58% have completed the supplemental, virtual PEERS course. Focus group discussions with 98 providers were examined according to four themes-training and education, app effectiveness, user experience and adherence and data privacy and safety. This yielded commonly endorsed facilitators (e.g., collaborative learning through group supervision, the convenience of consolidated patient data), barriers (e.g., difficulties with new technologies) and suggested changes (e.g., esthetic improvements, suicide risk assessment prompt). The PEERS app has the potential to scale measurement-based peer supervision to facilitate quality assurance of psychological treatments across contexts., Competing Interests: The authors have no conflicts of interest to disclose., (© The Author(s) 2024.)
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- 2024
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28. Digital Platform Uses for Help and Support Seeking of Parents With Children Affected by Disabilities: Scoping Review.
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Gruebner O, van Haasteren A, Hug A, Elayan S, Sykora M, Albanese E, Naslund J, Wolf M, Fadda M, and von Rhein M
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- Child, Humans, Social Support, Family, Privacy, Parents, Persons with Disabilities
- Abstract
Background: Receiving a diagnosis that leads to severe disability in childhood can cause a traumatic experience with long-lasting emotional stress for patients and family members. In recent decades, emerging digital technologies have transformed how patients or caregivers of persons with disabilities manage their health conditions. As a result, information (eg, on treatment and resources) has become widely available to patients and their families. Parents and other caregivers can use digital platforms such as websites or social media to derive social support, usually from other patients and caregivers who share their lived experiences, challenges, and successes on these platforms. However, gaps remain in our understanding of platforms that are most frequently used or preferred among parents and caregivers of children with disabilities. In particular, it is not clear what factors primarily drive or discourage engagement with these digital tools and what the main ethical considerations are in relation to these tools., Objective: We aimed to (1) identify prominent digital platforms used by parents or caregivers of children with disabilities; (2) explore the theoretical contexts and reasons for digital platform use, as well as the experiences made with using these platforms reported in the included studies; and (3) identify any privacy and ethical concerns emerging in the available literature in relation to the use of these platforms., Methods: We conducted a scoping review of 5 academic databases of English-language articles published within the last 10 years for diseases with childhood onset disability and self-help or parent/caregiver-led digital platforms., Results: We identified 17 papers in which digital platforms used by parents of affected children predominantly included social media elements but also search engines, health-related apps, and medical websites. Information retrieval and social support were the main reasons for their utilization. Nearly all studies were exploratory and applied either quantitative, qualitative, or mixed methods. The main ethical concerns for digital platform users included hampered access due to language barriers, privacy issues, and perceived suboptimal advice (eg, due to missing empathy of medical professionals). Older and non-college-educated individuals and ethnic minorities appeared less likely to access information online., Conclusions: This review showed that limited scientifically sound knowledge exists on digital platform use and needs in the context of disabling conditions in children, as the evidence consists mostly of exploratory studies. We could highlight that affected families seek information and support from digital platforms, as health care systems seem to be insufficient for satisfying knowledge and support needs through traditional channels., (©Oliver Gruebner, Afua van Haasteren, Anna Hug, Suzanne Elayan, Martin Sykora, Emiliano Albanese, John Naslund, Markus Wolf, Marta Fadda, Michael von Rhein. Originally published in the Journal of Medical Internet Research (https://www.jmir.org), 06.12.2022.)
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- 2022
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29. The impact of social drivers, conditional cash transfers and their mechanisms on the mental health of the young; an integrated retrospective and forecasting approach using the 100 million Brazilian Cohort: A study protocol.
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Machado DB, Azevedo Paiva de Araujo J, Alves FJO, Fernando Silva Castro-de-Araujo L, da Silva Rodrigues E, Fialho Morais Xavier E, Lins Rodrigues R, Rasella D, Naslund J, Patel V, and L Barreto M
- Subjects
- Adolescent, Adult, Brazil epidemiology, Financial Statements, Humans, Retrospective Studies, Mental Disorders, Mental Health
- Abstract
Background: Physical, emotional, and social changes, including exposure to poverty, abuse, or violence, increases youth vulnerability to mental illness. These factors interfere with development, limit opportunities, and hamper achievement of a fulfilling life as adults. Addressing these issues can lead to improved outcomes at the population level and better cost-effectiveness for health services. Cash transfer programs have been a promising way to address social drivers for poor mental health. However, it is still unclear which pathways and mechanisms explain the association between socioeconomic support and lower mental illness among youth. Therefore, we will evaluate the effect of social drivers on youth mental health-related hospitalizations and suicide, test mechanisms and pathways of a countrywide socioeconomic intervention, and examine the timing of the intervention during the life course., Methods: We will combine individual-level data from youth national hospitalization, mental health disorders and attempted suicide, suicide registries and notifications of violence, with large-scale databases, including "The 100 Million Brazilian Cohort", over an 18-year period (2001-2018). Several approaches will be used for the retrospective quasi-experimental impact evaluations, such as Regression Discontinuity Designs, Propensity Score Matching and difference-in-differences, combined with multivariable regressions for cohort analyses. We will run multivariate regressions based on hierarchical analysis approach to evaluate the association between important social drivers (mental health care, demographic and economic aspects) on mental health-related hospitalizations and suicide among youth. Furthermore, we will perform microsimulations to generate projections regarding how mental health-related hospitalizations and suicide trends will be in the future based on the current state, and how BFP implementation scenarios will affect these trends., Discussion: The results of this project will be of vital importance to guide policies and programs to improve mental health and reduce mental health-related hospitalizations and suicide in youth. It will provide information to improve the effectiveness of these programs worldwide. If cash transfers can decrease mental health problems among youth and reduce suicide., Competing Interests: The authors have declared that no competing interests exist.
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- 2022
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30. Exploring the Association Between Electronic Wearable Device Use and Levels of Physical Activity Among Individuals With Depression and Anxiety: A Population Level Study.
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Onyeaka H, Firth J, Enemuo V, Muoghalu C, Naslund J, Baiden P, and Torous J
- Abstract
Aim: The present study aimed to investigate the cross-sectional association between self-reported use of electronic wearable devices (EWDs) and the levels of physical activity among a representative sample of adults with depression and anxiety in the United States. Methods: For this cross-sectional study, data were pooled from the Health Information National Trends Survey 2019. A sample of 1,139 adults with self-reported depression and anxiety (60.9% women; mean age of 52.5 years) was analyzed. The levels of physical activity and prevalence of EWD utilization were self-reported. The chi-square tests were used to compare individual characteristics through the use of EWDs. Multivariable logistic regression was employed to investigate the association between EWDs and physical activity levels while adjusting for sociodemographic and health-related factors. Results: From the 1,139 adults with self-reported depression and anxiety, 261 (weighted percentage 28.1%) endorsed using EWD in the last year. After adjusting for covariates, the use of EWDs was only significantly associated with a higher odds of reporting intention to lose weight (OR 2.12; 95% CI 1.04, 4.35; p = 0.04). We found no association between the use of EWDs and meeting the national weekly recommendation for physical activity or resistance/strength exercise training. Conclusion: About three in 10 adults suffering from depression and anxiety in the United States reported using EWDs in the last year. The current study findings indicate that among people living with mental illness, EWD use is associated with higher odds of weight loss intent suggesting that EWDs may serve as an opening for the clinical interactions around physical health through identifying patients primed for behavior change. Further large-scale studies using randomized trial designs are needed to examine the causal relationships between EWDs and the physical activity of people with mental health conditions., Competing Interests: JF is supported by a University of Manchester Presidential Fellowship (P123958) and a UK Research and Innovation Future Leaders Fellowship (MR/T021780/1) and has received honoraria/consultancy fees from Atheneum, ParachuteBH and Nirakara, independent of this work. JT is supported by an American Psychiatric Association Research Fellowship. The remaining authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (Copyright © 2021 Onyeaka, Firth, Enemuo, Muoghalu, Naslund, Baiden and Torous.)
- Published
- 2021
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31. Smartphone Health Assessment for Relapse Prevention (SHARP): a digital solution toward global mental health - CORRIGENDUM.
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Rodriguez-Villa E, Mehta UM, Naslund J, Tugnawat D, Gupta S, Thirthalli J, Bhan A, Patel V, Chand PK, Rozatkar A, Keshavan M, and Torous J
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- 2021
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32. The effectiveness and cost-effectiveness of integrating mental health services in primary care in low- and middle-income countries: systematic review.
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Cubillos L, Bartels SM, Torrey WC, Naslund J, Uribe-Restrepo JM, Gaviola C, Díaz SC, John DT, Williams MJ, Cepeda M, Gómez-Restrepo C, and Marsch LA
- Abstract
Aims and Method: This systematic review examines the effectiveness and cost-effectiveness of behavioural health integration into primary healthcare in the management of depression and unhealthy alcohol use in low- and middle-income countries. Following PRISMA guidelines, this review included research that studied patients aged ≥18 years with unhealthy alcohol use and/or depression of any clinical severity. An exploration of the models of integration was used to characterise a typology of behavioural health integration specific for low- and middle-income countries., Results: Fifty-eight articles met inclusion criteria. Studies evidenced increased effectiveness of integrated care over treatment as usual for both conditions. The economic evaluations found increased direct health costs but cost-effective estimates. The included studies used six distinct behavioural health integration models., Clinical Implications: Behavioural health integration may yield improved health outcomes, although it may require additional resources. The proposed typology can assist decision-makers to advance the implementation of integrated models.
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- 2021
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33. What are young Indians saying about mental health? A content analysis of blogs on the It's Ok To Talk website.
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Gonsalves PP, Hodgson ES, Michelson D, Pal S, Naslund J, Sharma R, and Patel V
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- Adult, Female, Humans, India, Male, Internet, Mental Health, Personal Narratives as Topic
- Abstract
Objectives: This study used thematic content analysis to examine submissions to a youth mental health website, www.itsoktotalk.in, in India., Setting: We considered submissions made to the It's OK to Talk web platform during the first year of its operation (April 2017-March 2018), focusing specifically on website users based in India., Participants: We analysed 37 submissions by 33 authors aged 19-31 years (mean age 22 years) from seven Indian cities (New Delhi, Lucknow, Bengaluru, Mumbai, Pune, Hyderabad and Haryana). Eligible submissions were English-language first-person accounts of self-identified mental health problems, submitted in any media format for online publication by authors aged 18 years or older and who were based in India. Eight study participants were additionally involved in a focus group who contributed to the coding process and preparation of the final manuscript., Results: Four themes were identified: (1) living through difficulties; (2) mental health in context; (3) managing one's mental health and (4) breaking stigma and sharing hope. Overall, the participants expressed significant feelings of distress and hopelessness as a result of their mental health problems; many described the context of their difficulties as resulting from personal histories or wider societal factors; a general lack of understanding about mental health; and widespread stigma and other negative attitudes. Most participants expressed a desire to overcome mental health prejudice and discrimination., Conclusions: Personal narratives offer a window into young people's self-identified priorities and challenges related to mental health problems and recovery. Such insights can inform antistigma initiatives and other public awareness activities around youth mental health., Competing Interests: Competing interests: None declared., (© Author(s) (or their employer(s)) 2019. Re-use permitted under CC BY. Published by BMJ.)
- Published
- 2019
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34. Presenilin-1 mutation L271V results in altered exon 8 splicing and Alzheimer's disease with non-cored plaques and no neuritic dystrophy.
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Kwok JB, Halliday GM, Brooks WS, Dolios G, Laudon H, Murayama O, Hallupp M, Badenhop RF, Vickers J, Wang R, Naslund J, Takashima A, Gandy SE, and Schofield PR
- Subjects
- Adult, Aged, Amyloid beta-Peptides metabolism, Animals, Blotting, Western, Brain metabolism, Brain pathology, COS Cells, DNA, Complementary metabolism, Exons, Female, Gene Deletion, Genes, Dominant, Glycogen Synthase Kinase 3 metabolism, Glycogen Synthase Kinase 3 beta, Humans, Male, Mass Spectrometry, Middle Aged, Neurons pathology, Pedigree, Plasmids metabolism, Precipitin Tests, Presenilin-1, Protein Isoforms, RNA Splicing, Reverse Transcriptase Polymerase Chain Reaction, Transfection, Alzheimer Disease genetics, Membrane Proteins genetics, Mutation
- Abstract
The mutation L271V in exon 8 of the presenilin-1 (PS-1) gene was detected in an Alzheimer's disease pedigree. Neuropathological examination of affected individuals identified variant, large, non-cored plaques without neuritic dystrophy, reminiscent of cotton wool plaques. Biochemical analysis of L271V mutation showed that it increased secretion of the 42-amino acid amyloid-beta peptide, suggesting a pathogenic mutation. Analysis of PS-1 transcripts from the brains of two mutation carriers revealed a 17-50% increase in PS-1 transcripts with deletion of exon 8 (PS-1deltaexon8) compared with unrelated Alzheimer's disease brains. Exon trapping analysis confirmed that L271V mutation enhanced the deletion of exon 8. Western blots of brain lysates indicated that PS-1deltaexon8 was overexpressed in an affected individual. Biochemical analysis of PS-1deltaexon8 in COS and BD8 cells indicate the splice isoform is not intrinsically active but interacts with wild-type PS-1 to generate amyloid-beta. Western blots of cell lysates immunoprecipitated with anti-Tau or anti-GSK-3beta antibodies indicated that PS-1deltaexon8, unlike wild-type PS-1, does not interact directly with Tau or GSK-3beta, potential modifiers of neuritic dystrophy. We postulate that variant plaques observed in this family are due in part to the effects of PS-1deltaexon8 and that interaction between PS-1 and various protein complexes are necessary for neuritic plaque formation.
- Published
- 2003
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35. Alzheimer's disease. Molecular consequences of presenilin-1 mutation.
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Gandy S, Naslund J, and Nordstedt C
- Subjects
- Aged, Amyloid metabolism, Amyloid Precursor Protein Secretases, Amyloid beta-Protein Precursor metabolism, Aspartic Acid Endopeptidases, Brain metabolism, Endopeptidases metabolism, Humans, Membrane Proteins metabolism, Presenilin-1, Alzheimer Disease genetics, Membrane Proteins genetics, Mutation
- Abstract
Alzheimer's disease is characterized by accumulation in the brain of a family of insoluble amyloid peptides (Abeta peptides), which are produced as a result of the normal processing of beta-amyloid precursor protein (beta-APP). Russo et al. claim that a truncated Abeta peptide that lacks the first ten amino acids accumulates in the brains of patients carrying a mutant form of pre-senilin 1 (PS1), a protein that is involved in cleavage of beta-APP. However, we have found that this same species is also overrepresented in Alzheimer's patients with mutations in beta-APP itself. Our findings do not support the conclusion of Russo et al. that pathogenic PS1 mutations may control cleavage of beta-APP by beta-secretase.
- Published
- 2001
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36. Intraneuronal Abeta42 accumulation in human brain.
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Gouras GK, Tsai J, Naslund J, Vincent B, Edgar M, Checler F, Greenfield JP, Haroutunian V, Buxbaum JD, Xu H, Greengard P, and Relkin NR
- Subjects
- Adult, Aged, Aged, 80 and over, Brain pathology, Cadaver, Cognition Disorders metabolism, Cognition Disorders pathology, Dementia metabolism, Dementia pathology, Dementia psychology, Down Syndrome metabolism, Down Syndrome pathology, Humans, Immunohistochemistry, Infant, Middle Aged, Neurofibrillary Tangles pathology, Plaque, Amyloid pathology, Reference Values, Amyloid beta-Peptides metabolism, Brain metabolism, Neurons metabolism, Peptide Fragments metabolism
- Abstract
Alzheimer's disease (AD) is characterized by the deposition of senile plaques (SPs) and neurofibrillary tangles (NFTs) in vulnerable brain regions. SPs are composed of aggregated beta-amyloid (Abeta) 40/42(43) peptides. Evidence implicates a central role for Abeta in the pathophysiology of AD. Mutations in betaAPP and presenilin 1 (PS1) lead to elevated secretion of Abeta, especially the more amyloidogenic Abeta42. Immunohistochemical studies have also emphasized the importance of Abeta42 in initiating plaque pathology. Cell biological studies have demonstrated that Abeta is generated intracellularly. Recently, endogenous Abeta42 staining was demonstrated within cultured neurons by confocal immunofluorescence microscopy and within neurons of PS1 mutant transgenic mice. A central question about the role of Abeta in disease concerns whether extracellular Abeta deposition or intracellular Abeta accumulation initiates the disease process. Here we report that human neurons in AD-vulnerable brain regions specifically accumulate gamma-cleaved Abeta42 and suggest that this intraneuronal Abeta42 immunoreactivity appears to precede both NFT and Abeta plaque deposition. This study suggests that intracellular Abeta42 accumulation is an early event in neuronal dysfunction and that preventing intraneuronal Abeta42 aggregation may be an important therapeutic direction for the treatment of AD.
- Published
- 2000
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37. Estrogen reduces neuronal generation of Alzheimer beta-amyloid peptides.
- Author
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Xu H, Gouras GK, Greenfield JP, Vincent B, Naslund J, Mazzarelli L, Fried G, Jovanovic JN, Seeger M, Relkin NR, Liao F, Checler F, Buxbaum JD, Chait BT, Thinakaran G, Sisodia SS, Wang R, Greengard P, and Gandy S
- Subjects
- Alzheimer Disease, Animals, Cells, Cultured, Coculture Techniques, Embryo, Mammalian, Fetus, Humans, Mice, Neuroblastoma, Neurons cytology, Neurons drug effects, Peptide Fragments biosynthesis, Rats, Recombinant Proteins biosynthesis, Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization, Transfection, Tumor Cells, Cultured, Amyloid beta-Peptides biosynthesis, Amyloid beta-Protein Precursor biosynthesis, Cerebral Cortex cytology, Estradiol pharmacology, Neurons physiology
- Abstract
Alzheimer's disease (AD) is characterized by the accumulation of cerebral plaques composed of 40- and 42-amino acid beta-amyloid (Abeta) peptides, and autosomal dominant forms of AD appear to cause disease by promoting brain Abeta accumulation. Recent studies indicate that postmenopausal estrogen replacement therapy may prevent or delay the onset of AD. Here we present evidence that physiological levels of 17beta-estradiol reduce the generation of Abeta by neuroblastoma cells and by primary cultures of rat, mouse and human embryonic cerebrocortical neurons. These results suggest a mechanism by which estrogen replacement therapy can delay or prevent AD.
- Published
- 1998
- Full Text
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