1. Clinical Evaluation Research Unit, Kingston General Hospital, Kingston, Ontario, Canada
2. Department of Community Health and Epidemiology, Queen’s University, Kingston, Ontario, Canada
3. St. Michael’s Hospital, Toronto, Ontario, Canada
4. Department of Medicine, University of Toronto, Toronto, Ontario, Canada
5. Department of Medicine, Louisville School of Medicine, Louisville, Kentucky
6. Department of Medicine, Queen’s University, Kingston, Ontario, Canada