1. Division of Orthopedic Surgery, The Ottawa Hospital (TOH) , 501 Smyth Road, Ottawa, ON K1H 8L6, Canada
2. Faculty of Medicine, The University of Ottawa , Roger Guindon Hall, 451 Smyth Rd #2044, Ottawa, ON K1H 8M5, Canada
3. Clinical Epidemiology Program, The Ottawa Hospital Research Institute , 501 Smyth Road, Ottawa, ON K1H 8L6, Canada