1. Department of Surgery, University of Toronto, Toronto, Ontario, Canada.
2. Rick Hansen Institute, Vancouver, British Columbia, Canada.
3. University of Toronto Spine Program, Toronto, Ontario, Canada.
4. Division of Orthopaedics, Department of Surgery, Western University, London, Ontario, Canada.
5. SCI Clinical Research Unit, Toronto Western Hospital, Toronto, Ontario, Canada.
6. Department of Orthopaedics, University of British Columbia, Vancouver, British Columbia, Canada.