1. Prehospital Resuscitation and Emergency Care Research Unit (PRECRU), Curtin School of Nursing, Curtin University, Perth, Western Australia, Australia
2. Emergency Medicine, Medical School, the University of Western Australia, Crawley, Western Australia, Australia
3. School of Allied Health, University of Western Australia, Crawley, Western Australia, Australia
4. St John Western Australia, Belmont, Western Australia, Australia
5. School of Public Health and Preventive Medicine, Monash University, Melbourne, Victoria, Australia