1. Physiotherapy Department, Beaumont Hospital, Dublin 9, Ireland,
2. Royal College of Surgeons in Ireland, Dublin 2, Ireland,
3. Academic Unit of Neurology, School of Medicine, Trinity Biomedical Sciences Institute, Trinity College, Dublin 2, Ireland,
4. School of Medicine, Trinity College Dublin, Dublin 2, Ireland,
5. Department of Neurology, Beaumont Hospital, Dublin 9, Ireland