1. Prehospital Resuscitation and Emergency Care Research Unit, School of Nursing, Midwifery and Paramedicine; Curtin University; Perth Western Australia Australia
2. Discipline of Emergency Medicine, Faculty of Medicine, Dentistry and Health Sciences; The University of Western Australia; Perth Western Australia Australia
3. St John Ambulance; Belmont Western Australia Australia
4. Emergency Department; Sir Charles Gairdner Hospital; Perth Western Australia Australia
5. School of Population Health; The University of Western Australia; Perth Western Australia Australia
6. Emergency Medicine; Royal Perth Hospital; Perth Western Australia Australia
7. Centre for Clinical Research in Emergency Medicine; Harry Perkins Institute of Medical Research; Perth Western Australia Australia
8. Department of Epidemiology and Preventive Medicine; Monash University; Melbourne, Victoria Australia