1. Hornsby Ku-ring-gai Hospital; Sydney New South Wales Australia
2. Royal North Shore Hospital; Sydney New South Wales Australia
3. Emergency Department; John Hunter Hospital; Newcastle New South Wales Australia
4. School of Medicine and Public Health; The University of Newcastle; Newcastle New South Wales Australia
5. Department of Emergency Medicine; The University of Western Australia; Perth Western Australia Australia
6. Princess Alexandra Hospital; Brisbane Queensland Australia
7. School of Physiotherapy and Exercise Science; Curtin University; Perth Western Australia Australia
8. Department of Emergency Medicine; Washington University in St. Louis School of Medicine; St. Louis Missouri USA