1. From the Vascular Neurology Program (H.H., A.D.B., A.T.A., J.C.G., S.I.S.) and the Neurology Department, Statistical Analysis and Data Management Division (M.M.M.), The University of Texas at Houston, Houston, Texas; The University of California Los Angeles Stroke Center (D.S.L., J.G., J.L.S.), Los Angeles, Calif; and Tulane University Hospital and Clinic Stroke Center (S.B.M.-S.), New Orleans, La.