1. Department of Family Medicine, Dalhousie University, Halifax, Nova Scotia, Canada.
2. Department of Family Medicine, McMaster University, Hamilton, Ontario, Canada.
3. Department of Medicine, Queens University, Kingston, Ontario, Canada.
4. Department of Family Medicine, University of British Columbia, Vancouver, British Columbia, Canada.
5. Department of Pediatrics, University of Calgary, Calgary, Alberta, Canada.
6. Department of Oncology, University of Calgary, Calgary, Alberta, Canada.