1. Emergency Research; Murdoch Children's Research Institute; Melbourne Australia
2. Departments of Paediatrics and Critical Care; University of Melbourne; Melbourne Australia
3. Julius Center for Health Sciences and Primary Care; University Medical Center Utrecht; Utrecht Netherlands
4. Emergency Department; The Royal Children's Hospital; Melbourne Australia
5. Emergency Department; Queensland Children's Hospital, Children's Health Queensland; Brisbane Australia
6. Child Health Research Centre; University of Queensland; Brisbane Australia
7. Biomechanics and Spine Research Group, Centre for Children's Health Research, School of Mechanical, Medical and Process Engineering; Queensland University of Technology; Brisbane Australia