1. Combined Neurosurgical and Orthopaedic Spine Program, University of British Columbia, Vancouver, British Columbia, Canada;
2. The University of Texas MD Anderson Cancer Center, Houston, Texas;
3. Istituto Ortopedico Galeazzi, Milan, Italy;
4. Istituto Ortopedico Rizzoli, Bologna, Italy;
5. Oxford University Hospital, Oxford, United Kingdom;
6. Peking University Third Hospital, Beijing, China;
7. Brown University, Providence, Rhode Island;
8. Johns Hopkins University School of Medicine, Baltimore, Maryland;
9. National Center for Spinal Disorders, Budapest, Hungary;
10. Kanazawa Medical University, Kanazawa, Japan;
11. Mayo Clinic, Rochester, Minnesota;
12. Toronto Western Hospital, University of Toronto, Ontario, Canada;
13. University Hospital Carl Gustav Carus at the TU Dresden, Germany;
14. University of California, San Francisco, California;
15. Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts;
16. UCLA Health, Los Angeles, California;
17. Memorial Sloan Kettering Cancer Center, New York, New York; and
18. Sunnybrook Hospital, University of Toronto, Ontario, Canada