1. Toronto Western Hospital Morton and Gloria Shulman Movement Disorders Centre and the Edmond J. Safra Program in Parkinson's DiseaseUniversity of TorontoToronto Ontario Canada
2. Department of NeurologyColumbia University Medical CenterNew York New York USA
3. Department of BiostatisticsCollege of Public HealthUniversity of IowaIowa City Iowa USA
4. Departments of Neurology and NeurobiologyXuanwu Hospital of Capital Medical University China
5. Parkinson's Disease Research, Education and Clinical CenterMichael J. Crescenz VA Medical Center and Department of NeurologyPerelman School of MedicineUniversity of PennsylvaniaPhiladelphia Pennsylvania USA
6. The Michael J. Fox Foundation for Parkinson's ResearchNew York New York USA
7. Laboratory of Neurodegenerative DisordersDepartment of NeurologyHospital Clínic of BarcelonaInstitut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS)University of Barcelona, and the Centre for Networked Biomedical Research on Neurodegenerative Diseases (CIBERNED) Madrid Spain
8. Department of Neurology (Movement Disorders Unit)Hospital Universitario Donostia. Biodonostia Research Institute, Neurosciences area. San Sebastián, Guipúzcoa, Spain, and CIBERNED, Carlos III Health InstituteMadrid Spain
9. Parkinson's Disease and Movement Disorder CentreDivision of NeurologyDepartment of MedicineThe Ottawa HospitalOttawa Hospital Research InstituteUniversity of OttawaOttawa Ontario Canada
10. Department of NeurologyMount Sinai Beth Israel Medical Center and Icahn School of Medicine at Mount SinaiNew York New York USA
11. Parkinson's Disease and Movement Disorders Unit, Neurology ServiceHospital Clinic de BarcelonaUniversitat de Barcelona, Institutd'InvestigacionsBiomediquesAugust Pi I Sunyer (IDIBAPS), Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas (CIBERNED)Barcelona Spain
12. Department of NeurologyNorwegian University of Science and TechnologyTrondheim Norway