1. The Parkinson’s Institute, Sunnyvale, California, USA
2. Epidemiology Branch, National Institute of Environmental Health Sciences, National Institutes of Health, Department of Health and Human Services, Research Triangle Park, North Carolina, USA
3. Veterans Affairs Pacific Islands Health Care System, Honolulu, Hawaii, USA
4. Toronto Western Hospital, University of Toronto, Toronto, Ontario, Canada
5. Departments of Neurology and Clinical and Molecular Neurogenetics, University of Lubeck, Lubeck, Germany
6. Institute of Cognitive Neurology, Institute of Neuroscience, Favaloro University, Buenos Aires, Argentina
7. Westat Inc., Durham, North Carolina, USA
8. Center for Neurological Restoration, Cleveland Clinic, Cleveland, Ohio, USA
9. Department of Neurology, University of Kentucky, Lexington, Kentucky, USA
10. Biostatistics Branch, National Institute of Environmental Health Sciences, National Institutes of Health, Department of Health and Human Services, Research Triangle Park, North Carolina, USA
11. Occupational and Environmental Epidemiology Branch, Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Department of Health and Human Services, Bethesda, Maryland, USA