1. From the Division of Preventive Medicine, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, Mass (P.M.R., J.E.B., M.S., T.K.); Department of Epidemiology, Harvard School of Public Health, Boston, Mass (P.M.R., J.E.B., T.K.); Department of Neurology, Boston University School of Medicine, Boston, Mass (C.S.K); and INSERM Unit 708–Neuroepidemiology and University Pierre et Marie Curie, Paris, France (T.K.).