1. Departments of Neurology, University of Miami Miller School of Medicine, FL (V.J.D.B., T.R., R.L.S.).
2. Department of Neurology, Saint Louis University School of Medicine, MO (F.K.).
3. Department of Neurology, University of Colorado School of Medicine, Aurora (S.S.O.).
4. Department of Neurology, Vagelos College of Physicians and Surgeons (M.P., M.L., M.S.V.E., J.G.), Columbia University, New York.
5. National Institute of Neurologic Disorders and Stroke, Bethesda, MD (C.B.W.).
6. Department of Epidemiology, Mailman School of Public Health (M.S.E.V.), Columbia University, New York.