1. Edmund J. Safra Program, Movement Disorder Clinic; Toronto Western Hospital; Toronto Ontario Canada
2. University of Toronto Department of Medicine; Toronto Ontario Canada
3. Department of Neurology and Karl Landsteiner Institute for Neuroimmunological and Neurodegenerative Disorders; Danube Hospital; Vienna Austria
4. Division of Neurology and the Mah Pooi Soo & Tan Chin Nam Centre for Parkinson's & Related Disorders; University of Malaya; Kuala Lumpur Malaysia
5. Rush University Medical Center; Chicago Illinois USA
6. Jesse Brown VA Medical Center; Chicago Illinois USA
7. Department of Neurology, Academic Medical Center; University of Amsterdam; Amsterdam The Netherlands
8. Department of Neurology; Medical University Innsbruck; Innsbruck Austria
9. Department of Neurology, Santa Maria Hospital, Instituto de Medicina Molecular; University of Lisbon; Lisbon Portugal
10. Cure Huntington's Disease Initiative (CHDI) Management/CHDI Foundation, Princeton, NJ; USA
11. Instituto de Medicina Molecular; University of Lisbon; Lisbon Portugal