1. Simpson Centre for Health Services Research; The University of New South Wales; Sydney New South Wales Australia
2. Ingham Institute for Applied Medical Research; Sydney New South Wales Australia
3. Division of Emergency Medicine; Faculty of Health and Medical Sciences, The University of Western Australia; Perth Western Australia Australia
4. Emergency Department; Sir Charles Gairdner Hospital; Perth Western Australia Australia
5. Psychiatry Research and Teaching Unit; South Western Sydney Local Health District; Sydney New South Wales Australia
6. School of Psychiatry; Faculty of Medicine, The University of New South Wales; Sydney New South Wales Australia
7. Emergency Department; Royal Perth Hospital; Perth Western Australia Australia
8. Centre for Clinical Research in Emergency Medicine; Harry Perkins Institute of Medical Research; Perth Western Australia Australia
9. School of Public Health and Social Work; Queensland University of Technology; Brisbane Queensland Australia
10. Emergency Care Institute; Agency for Clinical Innovation; Sydney New South Wales Australia
11. Emergency Department; Prince of Wales Hospital; Sydney New South Wales Australia
12. Medical School, Australian National University, Canberra; Australian Capital Territory Australia
13. Emergency Department; Canberra Hospital, Canberra; Australian Capital Territory Australia
14. School of Nursing and Midwifery; Edith Cowan University; Perth Western Australia Australia