1. Division of Orthopaedic Surgery, Department of Surgery, University of Toronto, Toronto, Ontario, Canada
2. Sunnybrook Health Sciences Centre, Division of Orthopaedic Surgery, Toronto, Ontario, Canada
3. Institute for Clinical Evaluative Sciences, Toronto, Ontario, Canada
4. Institute of Health Policy, Management and Evaluation, University of Toronto, Toronto, Ontario, Canada
5. Mount Sinai Hospital, Division of General Surgery, Toronto, Ontario, Canada