1. School of Clinical Medicine, University of New South Wales, Kensington, NSW 2052, Australia
2. Department of Pain, Sydney Children’s Hospital, Randwick, NSW 2031, Australia
3. Children’s Pain Management Service, Department of Anaesthesia and Pain Management, Royal Children’s Hospital, Melbourne, VIC 3052, Australia
4. Department of Paediatrics, University of Melbourne, Melbourne, VIC 3052, Australia
5. Murdoch Children’s Research Institute, Melbourne, VIC 3052, Australia