1 Department of Paediatric Neurology and Neurophysiology, Children's University Hospital, Dublin D01 NY20, Ireland. Electronic address: eva.forman@cuh.ie.
2 Department of Paediatric Neurology and Neurophysiology, Children's University Hospital, Dublin D01 NY20, Ireland; Academic Centre on Rare Diseases, School of Medicine and Medical Science, University College Dublin, Dublin, Ireland.
3 Department of Paediatrics, National University of Ireland, Galway, Ireland; Department of Paediatrics, University Hospital Galway, Galway, Ireland.