1. Center for Clinical Epidemiology, Lady Davis Research Institute, Jewish General Hospital, Montreal, Quebec, Canada2Department of Oncology, McGill University, Montreal, Quebec, Canada
2. Center for Clinical Epidemiology, Lady Davis Research Institute, Jewish General Hospital, Montreal, Quebec, Canada3Department of Medicine, McGill University, Montreal, Quebec, Canada
3. Departments of Pediatrics and of Epidemiology, Biostatistics, and Occupational Health, McGill University, Montreal, Quebec, Canada5The Research Institute of the McGill University Health Centre, Montreal, Quebec, Canada
4. Manitoba Centre for Health Policy, Department of Community Health Sciences, University of Manitoba, Winnipeg, Manitoba, Canada7Department of Family Medicine, McMaster University, Hamilton, Ontario, Canada
5. Department of Anesthesiology, Pharmacology & Therapeutics, University of British Columbia, Vancouver, British Columbia, Canada
6. Department of Medicine, Western University, London, Ontario, Canada
7. Department of Internal Medicine, University of Montreal Health Centre, Montreal, Quebec, Canada
8. Health Quality Council, Saskatoon, Saskatchewan, Canada
9. Institute for Clinical Evaluative Sciences, Toronto, Ontario, Canada
10. Institute for Clinical Evaluative Sciences, Toronto, Ontario, Canada13Institute of Health Policy, Management and Evaluation, University of Toronto, Ontario, Toronto
11. Manitoba Centre for Health Policy, Department of Community Health Sciences, University of Manitoba, Winnipeg, Manitoba, Canada13Institute of Health Policy, Management and Evaluation, University of Toronto, Ontario, Toronto
12. Department of Family Medicine, University of Calgary, Calgary, Alberta, Canada