Institution
McGill University
Education•Montreal, Quebec, Canada•
About: McGill University is a education organization based out in Montreal, Quebec, Canada. It is known for research contribution in the topics: Population & Poison control. The organization has 72688 authors who have published 162565 publications receiving 6966523 citations. The organization is also known as: Royal institution of advanced learning & University of McGill College.
Topics: Population, Poison control, Health care, Cancer, Receptor
Papers published on a yearly basis
Papers
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TL;DR: The use of acid-suppressive therapy, particularly proton pump inhibitors, is associated with an increased risk of community-acquired C difficile and the unexpected increase in risk with nonsteroidal anti-inflammatory drug use should be investigated further.
Abstract: ContextRecent reports suggest an increasing occurrence and severity of Clostridium difficile–associated disease. We assessed whether the use of gastric acid–suppressive agents is associated with an increased risk in the community.ObjectiveTo determine whether the use of gastric acid–suppressive agents increases the risk of C difficile–associated disease in a community population.Design, Setting, and PatientsWe conducted 2 population-based case-control studies using the United Kingdom General Practice Research Database (GPRD). In the first study, we identified all 1672 cases of C difficile recorded between 1994 and 2004 among all patients registered for at least 2 years in each practice. Each case was matched to 10 controls on calendar time and the general practice. In the second study, a subset of these cases defined as community-acquired, that is, not hospitalized in the prior year, were matched on practice and age with controls also not hospitalized in the prior year.Main Outcome MeasuresThe incidence of C difficile and risk associated with gastric acid–suppressive agent use.ResultsThe incidence of C difficile in patients diagnosed by their general practitioners in the General Practice Research Database increased from less than 1 case per 100 000 in 1994 to 22 per 100 000 in 2004. The adjusted rate ratio of C difficile–associated disease with current use of proton pump inhibitors was 2.9 (95% confidence interval [CI], 2.4-3.4) and with H2-receptor antagonists the rate ratio was 2.0 (95% CI, 1.6-2.7). An elevated rate was also found with the use of nonsteroidal anti-inflammatory drugs (rate ratio, 1.3; 95% CI, 1.2-1.5).ConclusionsThe use of acid-suppressive therapy, particularly proton pump inhibitors, is associated with an increased risk of community-acquired C difficile. The unexpected increase in risk with nonsteroidal anti-inflammatory drug use should be investigated further.
942 citations
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Montreal General Hospital1, McGill University2, University of Pittsburgh3, SUNY Downstate Medical Center4, Toronto Western Hospital5, Johns Hopkins University School of Medicine6, University of Calgary7, University of Birmingham8, Hanyang University9, University College London10, NHS Lanarkshire11, Yeshiva University12, University of North Carolina at Chapel Hill13, Lund University14, University of Alabama at Birmingham15, Université de Montréal16, Dalhousie University17, University of British Columbia18, University of Western Ontario19, Royal University Hospital20, University of Manitoba21, Northwestern University22
TL;DR: The Lupus Survival Study Group data are reviewed and particularly the data from the State University of New York Health Science Center at Brooklyn, NY is reviewed.
Abstract: Objective. To examine mortality rates in the largest systemic lupus erythematosus (SLE) cohort ever assembled. Methods. Our sample was a multisite international SLE cohort (23 centers, 9,547 patients). Deaths were ascertained by vital statistics registry linkage. Standardized mortality ratio (SMR; ratio of deaths observed to deaths expected) estimates were calculated for-all deaths and by cause. The effects of sex, age, SLE duration, race, and calendar-year periods were determined. Results. The overall SMR was 2.4 (95% confidence interval 2.3-2.5). Particularly high mortality was seen for circulatory disease, infections, renal disease, non-Hodgkin's lymphoma, and lung cancer. The highest SMR estimates were seen in patient groups characterized by female sex, younger age, SLE duration < 1 year, or black/African American race. There was a dramatic decrease in total SMR estimates across calendar-year periods, which was demonstrable for specific causes including death due to infections and death due to renal disorders. However, the SMR due to circulatory diseases tended to increase slightly from the 1970s to the year 2001. Conclusion. Our data from a very large multicenter international cohort emphasize what has been demonstrated previously in smaller samples. These results highlight the increased mortality rate in SLE patients compared with the general population, and they suggest particular risk associated with female sex, younger age, shorter SLE duration, and black/African American race. The risk for certain types of deaths, primarily related to lupus activity (such as renal disease), has decreased over time, while the risk for deaths due to circulatory disease does not appear to have diminished. (Less)
940 citations
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TL;DR: Event-related functional magnetic resonance imaging was used to study the pattern of activation during four distinct stages in the performance of the Wisconsin Card Sorting Task and demonstrated specific involvement of different prefrontal areas during different stages of task performance.
Abstract: The Wisconsin Card Sorting Task (WCST) has been used to assess dysfunction of the prefrontal cortex and basal ganglia. Previous brain imaging studies have focused on identifying activity related to the set-shifting requirement of the WCST. The present study used event-related functional magnetic resonance imaging (fMRI) to study the pattern of activation during four distinct stages in the performance of this task. Eleven subjects were scanned while performing the WCST and a control task involving matching two identical cards. The results demonstrated specific involvement of different prefrontal areas during different stages of task performance. The mid-dorsolateral prefrontal cortex (area 9/46) increased activity while subjects received either positive or negative feedback, that is at the point when the current information must be related to earlier events stored in working memory. This is consistent with the proposed role of the mid-dorsolateral prefrontal cortex in the monitoring of events in working memory. By contrast, a cortical basal ganglia loop involving the mid-ventrolateral prefrontal cortex (area 47/12), caudate nucleus, and mediodorsal thalamus increased activity specifically during the reception of negative feedback, which signals the need for a mental shift to a new response set. The posterior prefrontal cortex response was less specific; increases in activity occurred during both the reception of feedback and the response period, indicating a role in the association of specific actions to stimuli. The putamen exhibited increased activity while matching after negative feedback but not while matching after positive feedback, implying greater involvement during novel than routine actions.
939 citations
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01 Aug 2003
TL;DR: Present evidence is sufficient to promote use of sterols and stanols for lowering LDL cholesterol levels in persons at increased risk for coronary heart disease.
Abstract: Foods with plant stanol or sterol esters lower serum cholesterol levels. We summarize the deliberations of 32 experts on the efficacy and safety of sterols and stanols. A meta-analysis of 41 trials showed that intake of 2 g/d of stanols or sterols reduced low-density lipoprotein (LDL) by 10%; higher intakes added little. Efficacy is similar for sterols and stanols, but the food form may substantially affect LDL reduction. Effects are additive with diet or drug interventions: eating foods low in saturated fat and cholesterol and high in stanols or sterols can reduce LDL by 20%; adding sterols or stanols to statin medication is more effective than doubling the statin dose. A meta-analysis of 10 to 15 trials per vitamin showed that plasma levels of vitamins A and D are not affected by stanols or sterols. Alpha carotene, lycopene, and vitamin E levels remained stable relative to their carrier molecule, LDL. Beta carotene levels declined, but adverse health outcomes were not expected. Sterol-enriched foods increased plasma sterol levels, and workshop participants discussed whether this would increase risk, in view of the marked increase of atherosclerosis in patients with homozygous phytosterolemia. This risk is believed to be largely hypothetical, and any increase due to the small increase in plasma plant sterols may be more than offset by the decrease in plasma LDL. There are insufficient data to suggest that plant stanols or sterols either prevent or promote colon carcinogenesis. Safety of sterols and stanols is being monitored by follow-up of samples from the general population; however, the power of such studies to pick up infrequent increases in common diseases, if any exist, is limited. A trial with clinical outcomes probably would not answer remaining questions about infrequent adverse effects. Trials with surrogate end points such as intima-media thickness might corroborate the expected efficacy in reducing atherosclerosis. However, present evidence is sufficient to promote use of sterols and stanols for lowering LDL cholesterol levels in persons at increased risk for coronary heart disease.
939 citations
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University of Paderborn1, University of Zurich2, Lawrence Berkeley National Laboratory3, IBM4, McGill University5, ETH Zurich6, Victoria University, Australia7, Aalto University8, University of Regensburg9, University of Lincoln10, Intel11, Pacific Northwest National Laboratory12, University of Insubria13, Bosch14, Science and Technology Facilities Council15, Paul Scherrer Institute16
TL;DR: CP2K as discussed by the authors is an open source electronic structure and molecular dynamics software package to perform atomistic simulations of solid-state, liquid, molecular, and biological systems, especially aimed at massively parallel and linear-scaling electronic structure methods and state-of-the-art ab initio molecular dynamics simulations.
Abstract: CP2K is an open source electronic structure and molecular dynamics software package to perform atomistic simulations of solid-state, liquid, molecular, and biological systems. It is especially aimed at massively parallel and linear-scaling electronic structure methods and state-of-the-art ab initio molecular dynamics simulations. Excellent performance for electronic structure calculations is achieved using novel algorithms implemented for modern high-performance computing systems. This review revisits the main capabilities of CP2K to perform efficient and accurate electronic structure simulations. The emphasis is put on density functional theory and multiple post–Hartree–Fock methods using the Gaussian and plane wave approach and its augmented all-electron extension.
938 citations
Authors
Showing all 73373 results
Name | H-index | Papers | Citations |
---|---|---|---|
Karl J. Friston | 217 | 1267 | 217169 |
Yi Chen | 217 | 4342 | 293080 |
Yoshua Bengio | 202 | 1033 | 420313 |
Irving L. Weissman | 201 | 1141 | 172504 |
Mark I. McCarthy | 200 | 1028 | 187898 |
Lewis C. Cantley | 196 | 748 | 169037 |
Martin White | 196 | 2038 | 232387 |
Michael Marmot | 193 | 1147 | 170338 |
Michael A. Strauss | 185 | 1688 | 208506 |
Alan C. Evans | 183 | 866 | 134642 |
Douglas R. Green | 182 | 661 | 145944 |
David A. Weitz | 178 | 1038 | 114182 |
David L. Kaplan | 177 | 1944 | 146082 |
Hyun-Chul Kim | 176 | 4076 | 183227 |
Feng Zhang | 172 | 1278 | 181865 |