1. From the Departments of Neurology (L.Z., Z.G.Z., R.Z., M.C.), Emergency Medicine (D.M.), and Biostatistics and Research Epidemiology (M.L.), Henry Ford Health Sciences Center, Detroit, Mich; the Laboratory of Blood and Vascular Biology, The Rockefeller University, New York, NY (B.S.C.); and the Department of Physics, Oakland University, Rochester, Mich (M.C.).