1. Ataxia Centre Department of Clinical and Movement Neurosciences UCL Queen Square Institute of Neurology University College London London UK
2. Department of Neurogenetics National Hospital for Neurology and Neurosurgery University College London Hospitals NHS Foundation Trust London UK
3. Department of Neuroscience Mayo Clinic Jacksonville Florida USA
4. Neuroscience Graduate Program Mayo Clinic Graduate School of Biomedical Sciences Jacksonville Florida USA
5. Department of Neurology Mayo Clinic Jacksonville Florida USA
6. Department of Neurodegenerative Disease UCL Queen Square Institute of Neurology London UK
7. UK Dementia Research Institute at UCL London UK
8. Department of Psychiatry and Neurochemistry Institute of Neuroscience and Physiology the Sahlgrenska Academy at the University of Gothenburg Mölndal Sweden
9. Clinical Neurochemistry Laboratory Sahlgrenska University Hospital Mölndal Sweden
10. Center for Neuroscience and Cell Biology University of Coimbra Coimbra Portugal
11. Coimbra University Hospital Centre Coimbra University Coimbra Portugal
12. Neurology Service University Hospital Marqués de Valdecilla‐IDIVAL University of Cantabria Centro de Investigación en Red de Enfermedades Neurodegenerativas (CIBERNED) Santander Spain
13. Department of Neurology University Hospital Bonn Bonn Germany
14. German Center for Neurodegenerative Diseases (DZNE) Bonn Germany
15. Department of Neurology RWTH Aachen University Aachen Germany
16. JARA‐BRAIN Institute Molecular Neuroscience and Neuroimaging Forschungszentrum Jülich RWTH Aachen University Aachen Germany
17. Faculdade de Ciências e Tecnologia Universidade dos Açores Ponta Delgada Portugal
18. Instituto de Biologia Molecular e Celular (IBMC) Instituto de Investigação e Inovação em Saúde (i3S) Universidade do Porto Porto Portugal
19. Department for Neurodegenerative Diseases Hertie‐Institute for Clinical Brain Research and Center for Neurology University of Tübingen Tübingen Germany
20. German Center for Neurodegenerative Diseases (DZNE) Tübingen Germany
21. Institute of Medical Genetics and Applied Genomics University of Tübingen Tübingen Germany
22. Lund University, Skåne University Hospital Clinical Sciences, Neurology Lund Sweden