1. Department of Neurological Sciences; Rush University Medical Center; Chicago; Illinois; USA
2. Department of Neurology; Oregon Health Sciences University and Portland VA Medical Center; Portland; Oregon; USA
3. Department of Neurology; University of South Florida; Tampa; Florida; USA
4. The Edmond J. Safra Program in Parkinson's Disease; University of Toronto; Toronto; Ontario; Canada
5. Department of Neurology; University of Alabama and Birmingham VA Medical Center; Birmingham; Alabama; USA
6. Department of Neurology; Innsbruck Medical University; Innsbruck; Austria
7. Clinical Investigation Center CIC9302 and Departments of Clinical Pharmacology and Neuroscience, INSERM; University Hospital of Toulouse and University of Toulouse III; Toulouse; France
8. Department of Neurology; Duke University; Durham; North Carolina; USA
9. Parkinson's Institute and Clinical Center; Sunnyvale; California; USA
10. Michael J. Fox Foundation for Parkinson's Research; New York City; New York; USA