1. Departments of Oncology and Family Medicine, Queen's University, Kingston, Ontario, Canada.
2. Department of Medicine, Queen's University, Kingston, Ontario, Canada.
3. Clinical Evaluation Research Unit, Kingston General Hospital, Kingston, Ontario, Canada.
4. Department of Medicine, Dalhousie University, Halifax, Nova Scotia.
5. Critical Care Medicine and Centre for Health Evaluation and Outcome Sciences, St. Paul's Hospital and University of British Columbia, Vancouver, British Columbia.