1. National Trauma Research Institute, Melbourne, Victoria;
2. Department of Neurosurgery, The Alfred Hospital, Melbourne, Victoria;
3. Department of Neurosurgery, Royal Melbourne Hospital, Parkville, Melbourne, Victoria;
4. Central Clinical School, Faculty of Medicine, Nursing and Health Sciences, Monash University, Melbourne, Victoria, Australia;
5. Department of Orthopaedics, University Medical Center Utrecht, The Netherlands;
6. Center for Spinal Surgery, Schön Klinik Nürnberg Fürth, Germany;
7. Sonnenhofspital Bern, University of Bern, Switzerland;
8. Spine Surgery Group, Catholic University of Parana, Curitiba, Brazil;
9. Center for Spine Surgery and Neurotraumatology, Frankfurt, Germany;
10. Department of Orthopaedic and Spine Surgery, Ganga Hospital, Coimbatore, India; and
11. The Rothman Institute at Thomas Jefferson University, Philadelphia, Pennsylvania