1. Department of Medicine, Cumming School of Medicine, University of Calgary, Calgary, Canada
2. Department of Medicine, Faculty of Medicine, McGill University, Montreal, Canada
3. Department of Family and Community Medicine, Faculty of Medicine, University of Toronto, Toronto, Canada
4. Department of Medicine, University of Manitoba, Winnipeg, Canada
5. Departments of Internal Medicine and Radiology, Rady College of Medicine, University of Manitoba, Winnipeg, Canada