1. Department of Orthopaedic Surgery, Royal Perth Hospital, Perth, WA 6009, Australia
2. Department of Emergency Medicine, Royal Perth Hospital, The University of Western Australia, Perth, WA 6009, Australia
3. Centre for Clinical Research in Emergency Medicine, Harry Perkins Institute of Medical Research, Perth, WA 6009, Australia
4. School of Surgery, University of Western Australia, Perth, WA 6009, Australia