1. Department of Clinical Epidemiology, Aarhus University and Aarhus University Hospital, Aarhus, Denmark
2. Department of Neurology, Hospital of the University of Pennsylvania, Philadelphia
3. Department of Epidemiology, Boston University School of Public Health, Boston, Massachusetts
4. Department of Epidemiology, Rollins School of Public Health, Emory University, Atlanta, Georgia
5. Department of Epidemiology and Biostatistics, University of California, San Francisco, San Francisco
6. Clinical Excellence Research Center, Stanford University, Palo Alto, California
7. Department of Epidemiology and Population Health, Stanford University, Palo Alto, California
8. Department of Neurology and Neurological Sciences, Stanford University, Palo Alto, California