7 Child Health Research Centre, Faculty of Medicine, The University of Queensland, Brisbane, Queensland, Australia.
8 Emergency Department, Monash Medical Centre, Melbourne, Victoria, Australia.
9 Department of Paediatrics and Centre for Integrated Critical Care, Faculty of Medicine, Dentistry and Health Sciences, The University of Melbourne, Melbourne, Victoria, Australia.
10 Emergency Department, The Townsville Hospital, Townsville, Queensland, Australia.
11 Emergency Department, University Hospital Geelong, Geelong, Victoria, Australia.
12 School of Medicine, Faculty of Health, Deakin University, Geelong, Victoria, Australia.
13 Emergency Department, Kidz First Middlemore Hospital, Auckland, New Zealand.
14 Department of Women's and Children's Health, University of Padova, Padova, Italy.
15 Emergency Department, Starship Children's Health, Auckland, New Zealand.
16 Departments of Surgery and Paediatrics: Child and Youth Health, The University of Auckland, Auckland, New Zealand.
17 Emergency Department, Perth Children's Hospital, Perth, Western Australia, Australia.
18 School of Medicine, Divisions of Emergency Medicine and Paediatrics, The University of Western Australia, Perth, Western Australia, Australia.