1. Department of Neuromuscular Diseases, Institute of Neurology, University College London, UK
2. Faculty of Sciences and Technology, University of Azores, Ponta Delgada, Portugal
3. Institute for Molecular and Cell Biology, Institute for Investigation and Innovation in Health (i3S), University of Porto, Porto, Portugal
4. The Queen Square Brain Bank for Neurological Disorders, UCL Queen Square Institute of Neurology, London, UK
5. Department of Clinical and Movement Neurosciences, UCL Queen Square Institute of Neurology, London, UK
6. Neurogenetics Unit, National Hospital for Neurology and Neurosurgery, London, UK
7. Department of Neurology, Hospital of Divino Espírito Santo, Ponta Delgada, Portugal
8. Ataxia Centre, Department of Clinical and Movement Neurosciences, UCL Queen Square Institute of Neurology, Queen Square, London, UK