1. From the Departments of Pediatrics (V.S.T., V.I.R., R.I.S.), Radiology (E.X.W., H.T.), Developmental Psychobiology (M.B.-M.), and Psychiatry (J.A.G.), Columbia University, New York, NY; and the Department of Medicine (M.V.F., D.J.P.), University of Michigan, Ann Arbor, Mich.