1. From the Stroke Program (R.J.L., L.D.L., D.A.L., D.B.Z., K.A.K., B.G.Z., G.M.C., D.L.B., L.B.M.), University of Michigan, Ann Arbor.
2. Department of Epidemiology (L.D.L., F.S.-K., E.C., L.B.M.), University of Michigan, Ann Arbor.
3. Department of Internal Medicine (D.A.L.), University of Michigan, Ann Arbor.