1. The Edmond J. Safra Program in Parkinson’s Disease, University Health Network, Division of Neurology, Department of Medicine, University of Toronto, Toronto, Ontario, Canada
2. Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, Ontario, Canada
3. Mayo Clinic, Jacksonville, Florida
4. University of Pennsylvania, Philadelphia
5. Columbia University, New York, New York
6. Hospital Clínic de Barcelona, Universitat de Barcelona, IDIBAPS, Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas (CIBERNED), Barcelona, Catalonia, Spain
7. Hospital Universitario Donostia, CIBERNED, San Sebastián, Spain
8. Bellvitge University Hospital, L’ Hospitalet de Llobregat, Barcelona, Spain
9. Veterans Affairs Medical Center, San Francisco, California
10. The Parkinson’s Institute, Sunnyvale, California
11. St Olavs Hospital, Trondheim, Norway
12. University of Turin, Turin, Italy
13. Erasmus MC, Rotterdam, the Netherlands
14. Skåne University Hospital and Lund University, Lund, Sweden
15. Parkinson Institute, Istituti Clinici di Perfezionamento, Milan, Italy
16. Centre Hospitalier Universitaire La Timone, Marseille, France
17. Sagamihara National Hospital, Kanagawa, Japan
18. Sorbonne Université, Pierre and Marie Curie University, Institut du Cerveau et de la Moelle Epinière, Institut National de la Santé et de la Recherche Médicale, Centre national de la recherche scientique, Paris, France
19. University of British Columbia, Vancouver, British Columbia, Canada