1. Parkinson's Disease and Movement Disorders Center, Division of Neurology, Department of Medicine, The Ottawa Hospital Research Institute; University of Ottawa; Ontario Canada
2. Psychiatry Department; Leiden University Medical Centre; and Centre for Mental Health Care Delfland Delft Netherlands
3. Krembil Research Institute, University Health Network and Institute of Health Policy, Management and Evaluation and Rehabilitation Institute; University of Toronto; Ontario Canada
4. 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 Supérieure Créteil-Paris France
5. School of Healthcare Sciences; Cardiff University; Cardiff Wales United Kingdom
6. Georgetown University, School of Medicine; Washington District of Columbia USA
7. Neurology and Clinical Pharmacology; University of Lisbon, Institute of Molecular Medicine; Lisbon Portugal
8. Department of Neurology; Innsbruck Medical University; Innsbruck Austria
9. Ribeirão Preto School of Medicine; University of São Paulo; São Paulo Brazil
10. CHDI Management/CHDI Foundation; Princeton New Jersey USA
11. Department of Neurological Sciences; Rush University Medical Center; Chicago Illinois USA
12. Department of Neurology; Hospital Universitário Hermanos Yagüe; Burgos Spain
13. National Center of Epidemiology and CIBERNED; Carlos III Institute of Health; Madrid Spain