1. Department of Emergency Medicine, Princess Alexandra Hospital; Brisbane Queensland Australia
2. School of Medicine; The University of Queensland; Brisbane Queensland Australia
3. Centre for Clinical Research in Emergency Medicine; Harry Perkins Institute of Medical Research; Perth Western Australia Australia
4. Emergency Department, Royal Perth Hospital; Perth Western Australia Australia
5. Discipline of Emergency Medicine; The University of Western Australia; Perth Western Australia Australia
6. Department of Emergency Medicine; Washington University School of Medicine in St. Louis; St. Louis Missouri USA
7. Emergency Department; John Hunter Hospital; Newcastle New South Wales Australia
8. Faculty of Health and Medicine; The University of Newcastle; Newcastle New South Wales Australia
9. Emergency Department; Liverpool Hospital; Sydney New South Wales Australia
10. School of Medicine, The University of Sydney; Sydney New South Wales Australia
11. Department of Surgery; Washington University School of Medicine in St. Louis; St. Louis Missouri USA