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