1. Clinical Evaluation Research Unit, Kingston General Hospital, Kingston, ON, Canada
2. Department of Community Health and Epidemiology, Queen’s University, Kingston, ON, Canada
3. Department of Medicine, University of Toronto, Toronto, ON, Canada
4. St. Michael’s Hospital, Toronto, ON, Canada
5. Division of Critical Care Medicine, The University of Alberta, Edmonton, Alberta
6. Department of Medicine, Queen’s University, Kingston, ON, Canada
7. Department of Medicine, Louisville School of Medicine, Louisville, Kentucky