1. Department of Radiation Oncology, University of Toronto, Toronto, Ontario, Canada
2. Department of Radiation Oncology, Hospital Sírio-Libanês, São Paulo, Brazil
3. Department of Radiation Oncology, University of Michigan, Ann Arbor
4. Division of Radiation Oncology, National Cancer Centre Singapore, Singapore
5. Oncology Academic Programme, Duke University/National University of Singapore (NUS) Medical School, Singapore
6. Department of Neurosurgery, Penn State Hershey Medical Center, Hershey, Pennsylvania
7. Radiation Medicine Program, Princess Margaret Cancer Centre, University Health Network, Toronto, Ontario, Canada
8. Department of Radiation Oncology, Amsterdam University Medical Center, Amsterdam, the Netherlands
9. Department of Neurosurgery, Multi-Disciplinary Spine Tumor Service, Memorial Sloan Kettering Cancer Center, New York, New York
10. Division of Neurosurgery, Hospital Sírio-Libanês, São Paulo, Brazil
11. Department of Neurosurgery, University of Michigan, Ann Arbor
12. Department of Radiation Oncology, University of Washington School of Medicine, Seattle
13. Department of Radiation Oncology, Multi-Disciplinary Spine Tumor Service, Memorial Sloan Kettering Cancer Center, New York, New York
14. Department of Oncology, Kingston General Hospital, Queen’s University, Kingston, Ontario, Canada
15. Division of Radiation Oncology, Department of Radiology and Oncology, Instituto do Câncer do Estado de São Paulo, Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil
16. Division of Radiation Oncology, Department of Oncology, Kingston General Hospital, Queen’s University, Kingston, Ontario, Canada