1. Department of Epidemiology and Preventive Medicine, School of Public Health and Preventive Medicine, Monash University, Melbourne, VIC 3004, Australia
2. Royal Australian Navy, Canberra, ACT 2600, Australia
3. Department of Intensive Care Medicine, Frankston Hospital, Peninsula Health, Frankston, VIC 3199, Australia
4. Health Data Research, Swansea University Medical School, Swansea SA1, UK
5. Behaviours and Health Risks Program, Burnet Institute, Melbourne 3004, Australia
6. Department of Neurosurgery, Alfred Hospital, Melbourne, VIC 3004, Australia
7. Australian Army, Canberra, ACT 2600, Australia
8. Department of Surgery, F. Edward Hebert School of Medicine, Uniformed Services University of Health Sciences, Bethesda, MD 20810, USA