1. Department of Internal Medicine, Max Rady College of Medicine, University of Manitoba, Winnipeg, Canada
2. Cardiac Sciences Program, Winnipeg Regional Health Authority, Manitoba, Canada
3. Max Rady College of Medicine, Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, Canada
4. Department of Community Health Sciences, University of Manitoba, Winnipeg, Canada
5. Department of Health, Behavior and Society, Johns Hopkins Bloomberg School of Public Health, Johns Hopkins University, Baltimore, MD, USA
6. Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Johns Hopkins University, Baltimore, MD, USA