1. Department of Paediatric Neurology, Department of Paediatrics and Child Health, Red Cross War Memorial Children’s, Hospital Neuroscience Institute, University of Cape Town, Klipfontein Road, Cape Town, Western Cape, 7700, South Africa
2. The Institute of Neuroscience and Muscle Research, The Children’s Hospital at Westmead, Sydney, Australia
3. Department of Neurology, Royal Children’s Hospital, Murdoch Children’s Research Institute and University of Melbourne, Melbourne, Victoria, Australia