1. Mayo Clinic, Rochester, Minnesota (M.C.)
2. Penn State Hershey Medical Center, Hershey, Pennsylvania (T.S.)
3. Department of Neurology, Georgetown University Hospital, Washington, DC (F.P.)
4. Parkinson's Disease and Movement Disorder Center of Boca Raton, Boca Raton, Florida (S.I.)
5. Parkinson's Disease Treatment Center of SW Florida, Port Charlotte, Florida (R.G.)
6. USF Parkinson's Disease and Movement Disorder Center, Tampa, Florida (R.A.H.)
7. Dartmouth Hitchcock Medical Center, Lebanon, New Hampshire (M.F.)
8. JEM Headlands Research Institute, Atlantis, Florida (M.G.)
9. Rocky Mountain Movement Disorder Center, Englewood, Colorado (R.K.)
10. The Parkinson's and Movement Disorder Institute, Fountain Valley, California (D.T.)
11. Palm Beach Neurology and Premiere Research Institute, West Palm Beach, Florida (N.C.)
12. Parkinson's and Movement Disorders Center, Cleveland Clinic, Cleveland, Ohio (B.L.W.)
13. SC3 Research Group, Pasadena, California (J.E.)
14. Atlanta Center for Medical Research, Atlanta, Georgia (R.R.)
15. Booth Gardner Parkinson's Care Center, EvergreenHealth, Kirkland, Washington (D.B.)
16. Parkinson's and Movement Disorders Center, Icahn School of Medicine at Mount Sinai, New York, New York (W.T.)
17. Parkinson's Disease and Movement Center, Albany Medical College, Albany, New York (E.M.)
18. Raleigh Neurology Associates, Raleigh, North Carolina (B.R.)
19. Neuro Pain Medical Center, Fresno, California (P.B.)
20. Associated Neurologists of Southern Connecticut, Fairfield, Connecticut (S.K.)
21. The Movement Disorder Clinic of Oklahoma, Tulsa, Oklahoma (K.K.)
22. Banner Sun Health Research Institute, Sun City, Arizona (D.S.)
23. Elias Research – Pharmax Research of South Florida, Inc., Miami, Florida (O.M.)
24. The Neuromedical Clinic of Central Louisiana, Alexandria, Louisiana (G.H.)
25. Parkinson's and Movement Disorders Center of Maryland, Elkridge, Maryland (S.G.)
26. MEDSOL Clinical Research, Port Charlotte, Florida (G.L.)
27. Metrolina Neurological Associates, Indian Land, South Carolina (H.M.)
28. Premier Neurology, Greer, South Carolina (M.H.)
29. BTC Network, Neurologic Associates of North Texas, Dallas, Texas (S.S.)
30. Elias Research, Neurology Diagnostics, Inc., Dayton, Ohio (J.V.)
31. Allied Biomedical Neurologic Research Institute, Miami, Florida (M.P.)
32. University of Cincinnati, Cincinnati, Ohio (A.D.)
33. University Physicians and Surgeons, Inc., Marshall Health, Huntington, West Virginia (V.S.)
34. Enterin, Inc., Philadelphia, Pennsylvania (W.K.)
35. MacDougall Statistical Institute, Haverhill, Massachusetts (J.M.)
36. Medstar-Georgetown Transplant Institute, Washington, DC, and Enterin Research Institute and Enterin, Inc., Philadelphia, Pennsylvania (M.Z.)
37. Enterin Research Institute and Enterin, Inc., Philadelphia, Pennsylvania (D.B.).