1. Department of Neurosurgery, The Alfred, Melbourne, Victoria, Australia
2. Department of Trauma, The Alfred, Melbourne, Victoria, Australia
3. Department of Surgery, Monash University, Melbourne, Victoria, Australia
4. National Trauma Research Institute, Melbourne, Victoria, Australia
5. Department of Emergency Medicine, The Alfred, Melbourne, Victoria, Australia
6. Department of Orthopaedics, The Alfred, Melbourne, Victoria, Australia
7. School of Public Health and Preventive Medicine, Monash University, Melbourne, Victoria, Australia