1. From the Departments of Neurology (D.C.H., S.W., W.H., C.P., F.N., C.H., R.J.A.) Biostatistics (J.L.W.), and Emergency Medicine (H.G.), Medical College of Georgia, Augusta; Department of Neurology, Mayo Clinic (S.L.), Rochester, Minn; and Medical College of Georgia Health Incorporated (W.H., C.P.), Augusta.