1. Department of Neurology, Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania
2. Center for Population Health Sciences, Stanford University, Palo Alto, California
3. Stanford University School of Medicine, Palo Alto, California
4. Department of Public Health, University of California, Merced, Merced, California
5. Environmental Health Sciences, Columbia Mailman School of Public Health, New York, New York
6. University of California at Berkeley School of Public Health, Berkeley, California
7. Epidemiology and Population Health, Stanford University School of Medicine, Stanford, California