1. Department of Neurology, Donders Institute for Brain, Cognition, and Behaviour Radboud University Medical Center Nijmegen The Netherlands
2. Department for Health Evidence, Biostatistics Section Radboud University Medical Center Nijmegen The Netherlands
3. Faculdade de Ciências e Tecnologia Universidade dos Açores Azores Portugal
4. Instituto de Biologia Molecular e Celular (IBMC), Instituto de Investigação e Inovação em Saúde (i3S) Universidade do Porto Porto Portugal
5. Department of Neurology Hospital Santo Espírito da ilha Terceira Azores Portugal
6. Center for Neuroscience and Cell Biology (CNC) University of Coimbra Coimbra Portugal
7. Center for Innovation in Biomedicine and Biotechnology (CIBB) University of Coimbra Coimbra Portugal
8. Faculty of Pharmacy University of Coimbra Coimbra Portugal
9. Department of Neurology and Center for Translational Neuro‐ and Behavioral Sciences (C‐TNBS), Essen University Hospital University of Duisburg‐Essen Essen Germany
10. Neurology Service, Centro de Investigación Biomédica en Red de Enfermedades Neurodegenerativas (CINERNED), University Hospital Marques de Valdecilla‐IDIVAL University of Cantabria‐UC Santander Spain
11. Department of Psychiatry and Behavioral Sciences Johns Hopkins University School of Medicine Baltimore Maryland USA
12. Ataxia Center, Department of Neurology University of Minnesota Minneapolis Minnesota USA
13. Department of Neurology University Hospital Heidelberg Heidelberg Germany
14. Department of Neurology RWTH Aachen University Aachen Germany
15. JARA‐BRAIN Institute Molecular Neuroscience and Neuroimaging Forschungszentrum Jülich GmbH and RWTH Aachen University Aachen Germany
16. Department of Neurology, Child Development Centre Coimbra's Hospital and University Centre Coimbra Portugal
17. Institute of Medical Genetics and Applied Genomics University of Tübingen Tübingen Germany
18. Department of Neurology, University Medical Center Groningen University of Groningen Groningen The Netherlands
19. Expertise Center Movement Disorders Groningen University Medical Center Groningen Groningen The Netherlands
20. Department of Neurodegenerative Diseases, Center for Neurology and Hertie Institute for Clinical Brain Research University of Tübingen Tübingen Germany
21. German Center for Neurodegenerative Diseases (DZNE) Tübingen Germany
22. Ataxia Centre, Department of Clinical and Movement Neurosciences, UCL Queen Square Institute of Neurology University College London London United Kingdom
23. Department of Neurogenetics, National Hospital for Neurology and Neurosurgery University College London Hospital NHS Foundation Trust London United Kingdom
24. Department of Neurology University Hospital Bonn Bonn Germany
25. German Center for Neurodegenerative Diseases (DZNE) Bonn Germany