1. From the Stroke Program (L.B.M., D.L.B., M.A.S., D.B.Z., N.G., K.A.K., L.E.S., W.J.M., J.F.B., E.E.A., L.D.L.), Emergency Medicine (L.B.M., W.J.M.), Epidemiology (L.B.M., L.D.L.), and Biostatistics (B.N.S., J.B.), University of Michigan, Ann Arbor.