1. Toronto Western Hospital, University Health Network, Toronto, Ontario, Canada
2. University of Toronto, Toronto, Ontario, Canada
3. University College Cork, Cork, Ireland
4. Washington University School of Medicine, St Louis, MO, USA
5. University of Sydney, Sydney, New South Wales, Australia
6. University of Maryland School of Medicine, Baltimore, MD, USA
7. The University of Kansas, Kansas City, KS, USA
8. University of Utah, Salt Lake City, Utah, USA
9. National Defense Medical College, Saitama, Japan
10. Spectrum Research, Inc, Tacoma, WA, USA
11. Toronto Rehabilitation Institute, University Health Network, Toronto, Ontario, Canada
12. Jefferson Medical College, Thomas Jefferson University, Philadelphia, PA, USA
13. University of California at Los Angeles, Los Angeles, CA, USA
14. University of Cambridge, Cambridge, UK
15. Vancouver General Hospital, Vancouver, British Columbia, Canada
16. The Centre for Family Medicine, Kitchener, Ontario, Canada
17. Department of Family Medicine, McMaster University, Hamilton, Ontario, Canada
18. Western University, London, Ontario, Canada
19. Nagoya University Graduate School of Medicine, Nagoya, Japan
20. Keio University School of Medicine, Keio, Japan
21. Emory University, Atlanta, GA, USA
22. Li Ka Shing Knowledge Institute, St Michael’s Hospital, Toronto, Ontario, Canada
23. Sunnybrook Health Sciences Centre, Toronto, Ontario, Canada
24. USC Spine Center, Los Angeles, CA, USA