1. From the Developmental and Metabolic Neurology Branch (D.F.M., G.A., C.K., R.F., R.O.B., R.S.), National Institute of Neurological Disorders and Stroke, the PET Department (P.H.), Clinical Center, and the Critical Care Medicine Department (M.T.G., M.P.-F.), Clinical Center, National Institutes of Health, Bethesda, Md; the Department of Neurology (L.T.C.S.), University of Vermont, Burlington; and the Department of Pathology and Laboratory Medicine (K.S.), School of Medicine, University of North...