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