1. Department of Epidemiology, Biostatistics and Occupational Health, McGill University , Montreal, Quebec , Canada
2. Research Institute of the McGill University Health Center, McGill University , Montreal, Quebec , Canada
3. Department of Medicine, Faculty of Medicine and Health Sciences, McGill University , Montreal, Quebec , Canada
4. Centre of Clinical Epidemiology, Lady Davis Institute, Jewish General Hospital, McGill University , Montreal, Quebec , Canada