1. Sydney Medical School, University of Sydney, Sydney, Australia
2. Department of Anaethesia, Westmead Hospital, Sydney, Australia
3. Greater Sydney Area Helicopter Emergency Medical Service, New South Wales, Ambulance Service, Australia
4. School of Civil Engineering, The University of Sydney, Australia
5. Department of Surgery, University of Melbourne, Melbourne, Australia
6. Department of Cardiology, Royal Prince Alfred Hospital, Sydney, Australia