1. Department of Emergency Medicine; Royal Children's Hospital; Melbourne Victoria Australia
2. Department of Emergency Research; Murdoch Children's Research Institute; Melbourne Victoria Australia
3. Emergency Department; Royal Children's Hospital; Melbourne Victoria Australia
4. Emergency Department; Princess Margaret Hospital for Children; Perth Western Australia Australia
5. Emergency Department; Canberra Hospital; Canberra Australian Capital Territory Australia
6. Department of Emergency Medicine; Townsville Hospital; Townsville Queensland Australia
7. Paediatric Emergency Department; Monash Medical Centre; Melbourne Victoria Australia
8. Department of Emergency Medicine; Frankston Hospital; Melbourne Victoria Australia
9. Department of Emergency Medicine; Women's and Children's Hospital; Adelaide South Australia Australia
10. Department of Emergency Medicine; Sunshine Hospital; Melbourne Victoria Australia
11. Department of Emergency Medicine; Children's Hospital; Sydney New South Wales Australia
12. Children's Emergency Department; Starship Children's Hospital; Auckland New Zealand
13. Middlemore Hospital; Auckland New Zealand
14. Department of Emergency Medicine; Kidz First Hospital; Auckland New Zealand
15. Department of Medical Imaging; Royal Children's Hospital; Melbourne Victoria Australia
16. Clinical Epidemiology and Biostatistics Unit; Murdoch Children's Research Institute; Melbourne Victoria Australia