1. Childhood Dementia Initiative , Brookvale, NSW 2100 , Australia
2. Brain and Mitochondrial Research Group, Murdoch Children’s Research Institute, Royal Children's Hospital , Parkville, Victoria 3052 , Australia
3. Department of Paediatrics, University of Melbourne , Parkville, Victoria 3010 , Australia
4. Department of Neurology, Sydney Children's Hospital Network , Randwick, NSW 2031 , Australia
5. Discipline of Paediatrics, School of Clinical Medicine, UNSW Medicine and Health, Sydney , NSW 2052 , Australia
6. THEMA Consulting Pty Ltd , Pyrmont, NSW 2009 , Australia
7. Discipline of Paediatrics, University of Adelaide , Women's and Children's Hospital, North Adelaide, South Australia 5006 , Australia
8. Department of Neurology and Clinical Neurophysiology, Women’s and Children’s Health Network , North Adelaide, South Australia 5006 , Australia