1. Center for Clinical Epidemiology; Lady Davis Institute, Jewish General Hospital/McGill University; Montreal Quebec Canada
2. Department of Epidemiology, Biostatistics, and Occupational Health; McGill University; Montreal Quebec Canada
3. Department of Emergency Medicine; McGill University Health Center; Montreal Quebec Canada
4. Division of Clinical Epidemiology; Department of Medicine; McGill University; Montreal Quebec Canada
5. Division of Clinical Epidemiology; McGill University Health Center; Montreal Quebec Canada
6. Divisions of Cardiology and Clinical Epidemiology; Jewish General Hospital/McGill University; Montreal Quebec Canada