1. * Department of Medicine, University of Saskatchewan, Saskatoon, Saskatchewan
2. † Department of Community Health Sciences, University of Calgary, Calgary
3. ‡ Departments of Surgery and Community Health Sciences, Intensive Care Unit Administration, Foothills Medical Centre, Calgary
4. § Peter Lougheed Hospital, University of Calgary, Calgary
5. ¶ Royal Alexandra Hospital, Edmonton, Alberta
6. # Department of Clinical Epidemiology, Ottawa Hospital Research Institute, The Ottawa Hospital, Ottawa, Ontario
7. ** Departments of Medicine and Community Health Sciences, University of Calgary and the Foothills Medical Centre, Calgary, Alberta, Canada