1. Department of Epidemiology, Mailman School of Public Health, Columbia University, New York, New York2Clinical Research Center, Helen Hayes Hospital, West Haverstraw, New York
2. Department of Preventive Medicine, Icahn School of Medicine at Mount Sinai, New York, New York
3. Department of Epidemiology, Mailman School of Public Health, Columbia University, New York, New York
4. Department of Neurology, Columbia University, New York, New York
5. Department of Neurology, University of California–Davis, Sacramento
6. Department of Neurological Sciences, University of Nebraska Medical Center, Omaha
7. Department of Neurology, Mayo Clinic, Rochester, Minnesota
8. Neurological Institute, Catania, Italy
9. Department of Psychiatry, New York State Psychiatric Institute, New York