1. Department of Emergency Medicine University of Ottawa Ottawa Ontario
2. Clinical Epidemiology Program Ottawa Hospital Research Institute University of Ottawa Ottawa Ontario
3. Department of Emergency Medicine Queen's University Kingston Ontario
4. Department of Emergency Medicine and School for Public Health University of Alberta and Alberta Health Services Edmonton Alberta Canada
5. Department of Medicine University of Ottawa Ottawa Ontario
6. Department of Emergency Medicine Cumming School of Medicine University of Calgary Calgary Alberta
7. Division of Emergency Medicine University of Toronto Toronto Ontario
8. University of Ottawa Heart Institute University of Ottawa Ottawa Ontario