1. From the Department of Neurology (A.D.B., H.H., J.C.G., E.A.N., N.R.G., K.I., S.M.-S., M.S.C. III, S.I.S.), Stroke Division, University of Texas at Houston Medical School; Department of Neurosciences (K.C.A.), University of California at San Diego; Department of Neurology (A.M.K.), University of Illinois at Chicago Medical School; Department of Radiology (H.M.S.), Baylor University School of Medicine, Houston, Tex; and Department of Radiology (R.U.W.), University of Texas at Houston Medical School.