1. From the Neurology Department, Henry Ford Health Sciences Center, Detroit, and the Physics Department, Oakland University, Rochester, Mich (M.C.); the Departments of Neurosurgery and Neurology, University of California at San Francisco (P.H.C.); the Neurology Department, Washington University School of Medicine, St Louis, Mo (C.Y.H.); and the Division of Stroke and Trauma, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, Md (M.E.C., T.P.J.).