1 Department of Neurology, Sydney Children's Hospital Network, Sydney, NSW 2031, Australia; Discipline of Paediatrics and Child Health, School of Clinical Medicine, UNSW Medicine and Health, UNSW Sydney, Sydney, NSW, Australia. Electronic address: m.farrar@unsw.edu.au.
2 Department of Neurology, Sydney Children's Hospital Network, Sydney, NSW 2031, Australia; Discipline of Paediatrics and Child Health, School of Clinical Medicine, UNSW Medicine and Health, UNSW Sydney, Sydney, NSW, Australia.