1. Department of Epidemiology (L.M.D., L.B.M., M.A.S., E.C.C., L.D.L.), University of Michigan School of Public Health, Ann Arbor.
2. Department of Biostatistics (X.S.), University of Michigan School of Public Health, Ann Arbor.
3. Stroke Program, University of Michigan Medical School, Ann Arbor (L.B.M., D.L.B., M.V.S.).