University College London - National Hospital for Neurology and Neurosurgery, Children's Hospital of Philadelphia, Tawam Hospital, Sheikh Khalifa Medical City, National Research Center, ASST-Spedali Civili of Brescia, University of Siena, University of Cambridge, University of Cambridge, Sultan Qaboos University, Sultan Qaboos University, ASST-Spedali Civili of Brescia, ASST-Spedali Civili of Brescia, Children’s Hospital Zagreb, Instituto Nacional de Medicina Genomica, University of Tübingen - Department of Cellular Neurology, King Faisal Specialist Hospital and Research Centre, Kermanshah University of Medical Sciences, Kermanshah University of Medical Sciences, Pianeta Salute, University of Campania Luigi Vanvitelli, University of California, San Diego (UCSD) - Rady Children’s Institute for Genomic Medicine, Istanbul University - Faculty of Medicine, University of Siena, University Hospital Careggi, University Hospital Careggi, Sheikh Khalifa Medical City, Sheikh Khalifa Medical City, University College London - National Hospital for Neurology and Neurosurgery, King Faisal Specialist Hospital and Research Centre, University of Siena, Centogene AG, University of Tübingen - Department of Neurology and Hertie-Institute for Clinical Brain Research, University of Tübingen, University of Miami - John P Hussman Institute for Human Genomics, University of Miami, Çukurova University - Faculty of Medicine, University of Queensland, Instituto Nacional de Medicina Genómica, General Hospital “Dr. Aurelio Valdivieso”, North Khorasan University of Medical Sciences, Centogene AG, 3billion Inc., University of London - Molecular and Clinical Sciences Research Institute, University of Freiburg - Center for Pediatrics and Adolescent Medicine, University of California, San Diego (UCSD) - Department of Neurosciences, Boston Children’s Hospital/Harvard Medical School, King Faisal Specialist Hospital and Research Centre, Shahid Beheshti University, University of Cambridge, University College London - UK Dementia Research Institute and University College London - UCL Queen Square Institute of Neurology

RWTH Aachen University - Department of Neurology, Forschungszentrum Jülich GmbH - ARA-BRAIN Institute Molecular Neuroscience and Neuroimaging, RWTH Aachen University - Department of Medical Statistics, UCL - Queen Square Institute of Neurology - Ataxia Centre, Fondazione IRCCS Istituto Neurologico ‘Carlo Besta’ - Unit of Medical Genetics and Neurogenetics, Fondazione IRCCS Istituto Neurologico ‘Carlo Besta’ - Unit of Medical Genetics and Neurogenetics, Hôpital de la Pitié-Salpêtrière - Sorbonne Université, Paris Brain Institute (ICM Institut du Cerveau), Hôpital de la Pitié-Salpêtrière - Sorbonne Université, Paris Brain Institute (ICM Institut du Cerveau), Medical University of Innsbruck - Department of Neurology, Medical University of Innsbruck - Department of Neurology, Ludwig Maximilian University of Munich (LMU) - The Friedrich-Baur-Institute, Ludwig Maximilian University of Munich (LMU) - The Friedrich-Baur-Institute, La Paz Institute for Health Research (IdiPAZ) - Reference Unit of Hereditary Ataxias and Paraplegias, University of Tübingen - Department of Neurology and Hertie-Institute for Clinical Brain Research, University of Tübingen - Department of Neurology and Hertie-Institute for Clinical Brain Research, University Hospital Bonn (UKB) - Department of Neurology, University Hospital Bonn (UKB) - Department of Neurology, RWTH Aachen University - Department of Neurology, Université Libre de Bruxelles (ULB) - Laboratory of Experimental Neurology, Université Libre de Bruxelles (ULB) - Laboratory of Experimental Neurology, RWTH Aachen University - Department of Neurology and Independent