1. Prehospital, Resuscitation and Emergency Care Research Unit, School of Nursing, Midwifery and Paramedicine; Curtin University; Perth Western Australia Australia
2. St John Ambulance Western Australia; Perth Western Australia Australia
3. Intensive Care Unit; Royal Perth Hospital; Perth Western Australia Australia
4. Division of Emergency Medicine, The University of Western Australia; Perth Western Australia Australia
5. Emergency Department; St John of God Murdoch Hospital; Perth Western Australia Australia
6. School of Public Health and Preventive Medicine; Monash University; Melbourne Victoria Australia