1. UCLA School of Medicine, Los Angeles, California, USA
2. Rush University Medical Center, Chicago, Illinois, USA
3. National Institute of Environmental Health Sciences, National Institutes of Health, Department of Health and Human Services, Research Triangle Park, North Carolina, USA
4. University of Rochester School of Medicine and Dentistry, Rochester, New York, USA
5. The Parkinson’s Institute and Clinical Center, Sunnyvale, California, USA
6. Parkinson’s Disease Research, Education, and Clinical Center, Philadelphia, Pennsylvania, USA
7. California Department of Health Services, Oakland, California, USA
8. U.S. Army Medical Research and Material Command, Fort Detrick, Maryland, USA
9. Institute of Cancer Epidemiology, Danish Cancer Society, Copenhagen, Denmark
10. National Institute of Neurological Disorders and Stroke, National Institutes of Health, Department of Health and Human Services, Bethesda, Maryland, USA
11. University of Bari, Bari, Italy
12. Stanford University School of Medicine, Stanford, California, USA
13. University of Rochester School of Medicine, Rochester, New York, USA
14. Mayo Clinic, Rochester, Minnesota, USA
15. Pacific Health Research Institute, Honolulu, Hawaii, USA
16. Science and Environmental Health Network, Ames, Iowa, USA
17. Massachusetts General Hospital, Boston, Massachusetts, USA
18. University of Miami Miller School of Medicine, Miami, Florida, USA
19. New York State Department of Health, Albany, New York, USA
20. National Institutes of Health, Bethesda, Maryland, USA
21. Rollins School of Public Health, Atlanta, Georgia, USA
22. Kaiser Permanente, Oakland, California, USA
23. Harvard School of Public Health, Boston, Massachusetts, USA