1 Department of Neurology and Clinical Neurophysiology, Temple Street Children's University Hospital, Dublin 1, Ireland. Electronic address: lagann@tcd.ie.
2 Department of Neurology and Clinical Neurophysiology, Temple Street Children's University Hospital, Dublin 1, Ireland.
3 Department of Neurology and Clinical Neurophysiology, Temple Street Children's University Hospital, Dublin 1, Ireland; Academic Centre on Rare Diseases, School of Medicine and Medical Science, University College Dublin, Ireland.