1. Combined Neurosurgical and Orthopedic Spine Program, Vancouver General Hospital, University of British Columbia, Vancouver, BC, Canada
2. University Medical Centers, Utrecht, Netherlands
3. AO Spine, AO Network Clinical Research, AO Foundation, Davos, Switzerland
4. Harborview Medical Center, Department of Orthopaedics and Sports Medicine, University of Washington, Seattle, WA, USA
5. Center for Spinal and Scoliosis Surgery, Malteser Waldkrankenhaus St. Marien, Erlangen, Germany
6. Private Medical University Nuremberg, Nuremberg, Germany
7. Department of Orthopaedic Surgery, Rothman Institute, Thomas Jefferson University Hospital, Philadelphia, PA, USA
8. Spine Unit, Sonnenhof Spital, University of Bern, Bern, Switzerland
9. Cajuru Hospital, Catholic University of Paraná, Curitiba, Brazil
10. Department of Orthopaedics and Spine Surgery, Ganga Hospital, Coimbatore, India
11. Department of Orthopaedic and Trauma Surgery, Faculty of Medicine, Assiut University, Assiut, Egypt
12. Department of Neurosurgery, Prince Mohammed Bin Abdulaziz Hospital, Riyadh, Saudi Arabia
13. Department of Neurosurgery, Mansoura University, Mansoura, Egypt
14. Klinika Úrazovej Chirurgie SZU a FNsP F.D.Roosevelta, Banská Bystrica, Slovakia
15. Prof. Dr. N. Oblu” Emergency Hospital, Iasi, Romania
16. Department of Neurosurgery, National Trauma Research Institute (NTRI), The Alfred Hospital, Melbourne, VIC, Australia
17. Orthopaedic and Traumatology Department, Institute of Orthopedics “Carlos E. Ottolenghi” Hospital Italiano de Buenos Aires, Buenes Aires, Argentina
18. Neurosurgery Division, Department of Neurology, State University of Campinas, Sao Paulo, Brazil
19. Rambam Health Care Campus, Haifa, Israel
20. Sri Balaji Action Medical Institute, New Delhi, India
21. Department of Orthopaedic Surgery and Traumatology, Inselspital, University Hospital, University of Bern, Bern, Switzerland
22. Department of Orthopaedics, Trauma Surgery and Plastic Surgery, University of Leipzig, Leipzig, Germany