1. From the Departments of Epidemiology (L.D.L., L.B.M.) and Biostatistics (B.N.S., J.B.), University of Michigan School of Public Health, Ann Arbor; and Stroke Program, University of Michigan Health System, Ann Arbor (L.D.L., L.E.S., M.A.S., N.G., D.L.B., L.B.M.).