1. Combined Neurosurgical and Orthopedic Spine Program, Department of Orthopedics Surgery, University of British Columbia, Vancouver, British Columbia;
2. Department of Orthopedics Surgery, London Health Science Centre, Western University, London, Ontario;
3. Canadian Spine Outcomes and Research Network, Markdale, Ontario;
4. Divisions of Orthopaedic Surgery and Neurosurgery, University of Toronto, Ontario;
5. Combined Neurosurgical and Orthopedic Spine Program, University of Calgary, Alberta;
6. Centre de Recherche CHU de Quebec, CHU de Québec-Université Laval, Quebec City, Quebec;
7. Department of Surgery, University of Toronto, Ontario;
8. Department of Orthopedics Surgery, McGill University Health Centre, Montreal, Quebec;
9. Department of Surgery, Section of Orthopedics and Neurosurgery, University of Manitoba, Winnipeg, Manitoba;
10. Division of Neurosurgery, Department of Surgery, University of Alberta Hospital, Edmonton, Alberta;
11. Canada East Spine Centre, Division of Neurosurgery, Zone 2, Horizon Health Network, Saint John, New Brunswick;
12. Canada East Spine Centre, Saint John Orthopedics, Dalhousie Medicine New Brunswick, Saint John Campus, Saint John, New Brunswick;
13. Department of Orthopedics Surgery, The Ottawa Hospital, Ottawa, Ontario; and
14. Division of Neurosurgery, Dalhousie University, Halifax, Nova Scotia, Canada