1. Department of Orthopedics Surgery, University of British Columbia, Vancouver, BC, CA
2. Canadian Spine Outcomes and Research Network, Markdale, ON, CA
3. Department of Surgery, University of Toronto, Toronto, ON, CA
4. Centre de Recherche CHU de Quebec, CHU de Quebec-Universite Laval, Quebec City, QC, CA
5. Canada East Spine Centre, Saint John, NB, CA
6. London Health Science Centre, Western University, London, ON, CA
7. McGill University Health Centre, Montreal, QC, CA
8. Department of Surgery, University of Manitoba, Winnipeg, MB, Canada
9. Department of Surgery, University of Alberta Hospital, Edmonton, AL, CA
10. Department of Surgery, Dalhousie University, Halifax, NS, CA
11. Northern Ontario School of Medicine, ON, CA
12. Divisions of Orthopaedic and Neurosurgery, University of Toronto, Toronto, ON, CA
13. The Ottawa Hospital, Ottawa, ON, CA
14. Sunnybrook Health Sciences Centre, Toronto, ON, CA
15. University of Calgary, Calgary, AL, CA