1. a Department of Neurology , College of Physicians and Surgeons, Columbia University , New York, NY, USA
2. b Taub Institute for Research on Alzheimer's Disease and the Aging Brain, College of Physicians and Surgeons, Columbia University , New York, NY, USA
3. c Gertrude H. Sergievsky Center, College of Physicians and Surgeons, Columbia University , New York, NY, USA
4. d Department of Epidemiology , Mailman School of Public Health, Columbia University , New York, NY, USA
5. e Department of Neurology/Movement Disorder Section , Chicago, IL, USA
6. f Parkinson's Disease and Movement Disorders Center, Pennsylvania Hospital , Philadelphia, PA, USA
7. g The Institute for Neurodegenerative Disorders , New Haven, CT, USA
8. h Struthers Parkinson's Center, Park Nicollet Clinic , Golden Valley, MN, USA
9. i The Alan and Barbara Mirken Department of Neurology , Beth Israel Medical Center , New York, NY, USA
10. j Department of Neurology , Albert Einstein College of Medicine , Bronx, NY, USA
11. k Dr. John T Macdonald Foundation, Department of Human Genetics , Miami Institute for Human Genomics, Miller School of Medicine, University of Miami , Miami, FL, USA
12. l Parkinson's Institute , Sunnyvale, CA, USA
13. m Marshfield Clinic, Department of Neurology , Marshfield, WI, USA
14. n New York State Psychiatric Institute, Data Coordinating Center , New York, NY, USA
15. o Department of Neurology , NorthShore University Health System , Evanston, IL, USA
16. p Department of Neurology , Northwestern University, Feinberg School of Medicine , Chicago, IL, USA
17. q Parkinson's Disease and Movement Disorders Center of NeuroHealth , Warwick, RI, USA
18. r Department of Clinical Neurosciences , The Warren Alpert School of Medicine of Brown University , Providence, RI, USA
19. s Department of Neurology , College of Medicine, University of Tennessee Health Science Center , Memphis, TN, USA
20. t Morris K. Udall Parkinson's Disease Research Center of Excellence, Johns Hopkins University School of Medicine , Baltimore, MD, USA
21. u Department of Psychiatry and Behavioral Sciences Johns Hopkins University School of Medicine , Baltimore, MD, USA
22. v Department of Neurology and Neurological Sciences Johns Hopkins University School of Medicine , Baltimore, MD, USA
23. w Medical College of Wisconsin , Milwaukee, WI, USA
24. x Division of Epidemiology , New York State Psychiatric Institute , New York, NY, USA
25. y Department of Pathology and Cell Biology , College of Physicians and Surgeons, Columbia University , New York, NY, USA
26. z Center for Human Genetics, College of Physicians and Surgeons, Columbia University , New York, NY, USA
27. aa Department of Psychiatry , Columbia University Medical Center , New York, NY, USA