1. Parkinson's Disease and Movement Disorders Center, Division of Neurology, Department of Medicine, The Ottawa Hospital Research InstituteUniversity of Ottawa Brain and Mind InstituteOttawa Ontario Canada
2. Assistance Publique‐Hôpitaux de Paris, National Centre of Reference for Huntington's Disease, Neurology Department; Université Paris Est, Créteil; INSERM U955 E01, Institut Mondor De Recherché Biomédicale, École Normale SupérieureCréteil‐Paris France
3. Department of NeurologyLeiden University Medical CenterLeiden The Netherlands
4. Institute of Cognitive and Clinical Neuroscience, School of Psychological SciencesMonash UniversityMelbourne Australia
5. Departments of Neurology, Psychiatry, Psychological and Brain Sciences, Carver College of MedicineUniversity of IowaIowa City Iowa USA
6. Division of Neurological and Physical Medicine Devices, Office of Device Evaluation, Center for Devices and Radiological HealthUnited States Food and Drug Administration USA
7. Department of Neurology, Center for Alzheimer's Care, Imaging, and ResearchUniversity of UtahSalt Lake City Utah USA
8. CHDI Foundation/CHDI ManagementPrinceton NJ USA
9. Department of Neurological SciencesRush University Medical CenterChicago Illinois USA
10. Department of NeurologyHospital Universitário Hermanos YagüeBurgos Spain
11. National Center of Epidemiology and CIBERNED, Carlos III Institute of HealthMadrid Spain