1. Division of Spine, Department of Orthopaedics, University of British Columbia and Vancouver Coastal Health, Vancouver, British Columbia, Canada
2. Department of Degenerative and Oncological Spine Surgery, Rizzoli Institute, Bologna, Italy
3. National Center for Spinal Disorders and Buda Health Center, Budapest, Hungary
4. Division of Neurosurgery, Department of Surgery, University of Toronto and Toronto Western Hospital, Toronto, Ontario, Canada
5. Department of Neurosurgery, Memorial Sloan-Kettering Cancer Center, New York, New York, United States
6. Orthopaedic Surgery, The CORE Institute, Sun City West, Arizona, United States
7. Oncologia Ortopedica e Ricostruttiva del Rachide, Istituto Ortopedico Galeazzi, Milano, Italy
8. Department of Orthopaedics, Princess Alexandra Hospital, Brisbane, Queensland, Australia
9. Department of Orthopaedic Surgery, University of California San Francisco, San Francisco, California, United States
10. Department of Neurological Surgery, University of California San Francisco, San Francisco, California, United States
11. Spinal Division, Oxford University Hospital NHS Trust, Oxford, United Kingdom
12. Queens Medical Centre, Nottingham University Hospital NHS Trust, Nottingham, United Kingdom
13. Department of Neurosurgery, MD Anderson Cancer Center, The University of Texas, Houston, Texas, United States
14. Department of Neurosurgery, Johns Hopkins University School of Medicine, Baltimore, Maryland, United States