1. Department of Neurosurgery Memorial Sloan Kettering Cancer Center New York New York
2. Department of Orthopedics University Medical Center Utrecht Utrecht The Netherlands
3. Department of Radiation Oncology, Sunnybrook Odette Cancer Center University of Toronto Toronto Ontario Canada
4. Department of Neurosurgery The University of Texas MD Anderson Cancer Center Houston Texas
5. Department of Neurological Surgery Weill Cornell Medical College New York New York
6. Department of Neurosurgery Johns Hopkins University School of Medicine Baltimore Maryland
7. Department of Neurosurgery, Hospital University of Pennsylvania Philadelphia Pennsylvania
8. Division of Surgery McGill University, Montreal General Hospital Montreal Quebec Canada
9. National Center for Spinal Disorders and Buda Health Center Budapest Hungary
10. GSpine4 Spine Surgery Division IRCCS Galeazzi Orthopedic Institute Milan Italy
11. Division of Neurosurgery and Spine Program University of Toronto, Toronto Western Hospital Toronto Ontario Canada
12. Department of Radiation Oncology Memorial Sloan Kettering Cancer Center New York New York
13. Department of Neurosurgery Mayo Clinic Rochester Minnesota
14. Department of Neurosurgery The University of Kansas Hospital Kansas City Kansas
15. Department of Neurosurgery The Warren Alpert Medical School of Brown University and Rhode Island Hospital, The Miriam Hospital, Brown University Providence, Rhode Island
16. Division of Spine, Department of Orthopaedics University of British Columbia, Vancouver General Hospital Vancouver British Columbia Canada
17. Research Department AOSpine International Davos Switzerland