1. Centre for Clinical Research in Emergency Medicine; Harry Perkins Institute of Medical Research; Perth Western Australia Australia
2. Emergency Medicine; University of Western Australia; Perth Western Australia Australia
3. Department of Emergency Medicine; Royal Perth Hospital; Perth Western Australia Australia
4. Department of Respiratory Medicine; Royal Perth Hospital; Perth Western Australia Australia
5. Department of Respiratory Medicine; Fremantle Hospital; Fremantle Western Australia Australia
6. Department of Emergency Medicine; Armadale Health Service; Perth Western Australia Australia
7. Department of Emergency Medicine; Bunbury Regional Hospital; Bunbury Western Australia Australia
8. Department of Emergency Medicine; Austin Hospital; Melbourne Victoria Australia
9. Department of Medicine; University of Melbourne; Melbourne Victoria Australia