1. Department of Surgery
2. Department of Community Health and Epidemiology
3. Clinical Evaluation Research Unit, Kingston General Hospital, Kingston, Ontario, Canada
4. Division of Critical Care Medicine, University of Alberta, Edmonton, Alberta, Canada
5. Departments of Surgery and Critical Care, Ottawa Hospital and University of Ottawa, Ottawa, Ontario, Canada
6. Department of Anesthesiology, University of Colorado School of Medicine, Denver, Colorado
7. Department of Medicine, Queen’s University, Kingston, Ontario, Canada