1. From the Comprehensive Stroke Center (A.V.A., G.T., R.M.S.), University of Alabama Medical School, Birmingham; Stroke Program (A.V.A., R.M., M.R., R.M.S., A.B., J.C.G.), The University of Texas-Houston Medical School, Houston; Neurosonology and Stroke Program (A.V.A., V.K.S., A.Y.L., G.T., M.D.M.), Barrow Neurological Institute, Phoenix, Ariz; and Emergency Medicine (P.S.), Christiana Healthcare, Wilmington, Del.