Curr Opin Pediatr 2017 Dec;29(6):674-682
aComplex Motor Disorder Service, Paediatric Neurosciences, Evelina London Children's Hospital, Guy's and St Thomas' NHS Foundation Trust, Westminister Bridge Road, London, United Kingdom bDepartment of Paediatric Neurology and Clinical Neurophysiology, Temple Street Children's University Hospital cAcademic Centre on Rare Diseases, University College, Dublin dDepartment of Paediatrics, National University of Ireland Galway eGalway University Hospital, Galway, Ireland.