1 Department of Neurology, John Hunter Hospital, Newcastle, Australia; Hunter Medical Research Institute, University of Newcastle, Australia. Electronic address: jeannette.lechnerscott@health.nsw.gov.au.
2 School of Medical, Indigenous and Health Sciences, University of Wollongong, Wollongong, Australia.
3 Blizard Institute, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London, UK.
4 Department of Neurology, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA.
5 Division of Neurology, Department of Pediatrics, The Hospital for Sick Children, University of Toronto, ON, Canada.