1. Department of Surgery, Schulich School of Medicine & Dentistry, The University of Western Ontario, London, Ontario, Canada
2. School of Health Studies, Faculty of Health Sciences, The University of Western Ontario, London, Ontario, Canada
3. Department of Surgery, Division of Orthopaedic Surgery, McMaster University, Hamilton, Ontario, Canada
4. Department of Clinical Epidemiology & Biostatistics, Faculty of Health Sciences, McMaster University, Hamilton, Ontario, Canada