1. Department of Epidemiology and Preventive MedicineMonash University Melbourne Victoria Australia
2. South Australian Ambulance Service Adelaide South Australia Australia
3. Ambulance Victoria Melbourne Victoria Australia
4. Faculty of Health Sciences, Curtin University Perth Western Australia Australia
5. St John Ambulance Western Australia Perth Western Australia Australia
6. Faculty of Medicine and Health Sciences, The University of Western Australia Perth Western Australia Australia
7. Emergency and Trauma Centre, Alfred Hospital Melbourne Victoria Australia