1. Department of Neurology, Vagelos College of Physicians and Surgeons (M.S.V.E.), Columbia University, New York, NY.
2. Department of Epidemiology, Mailman School of Public Health (M.S.V.E.), Columbia University, New York, NY.
3. Department of Epidemiology, School of Public Health (L.L.), University of Michigan, Ann Arbor.
4. Department of Epidemiology, School of Public Health (V.J.H.), University of Alabama at Birmingham.
5. Department of Neurology (D.K.), University of Michigan, Ann Arbor.
6. Department of Biostatistics, UAB School of Public Health (G.H.), University of Alabama at Birmingham.