1. From the Departments of Radiology and Radiological Sciences (V.B.H., M.N.H.) and Pediatrics (T.R.B.), Uniformed Services University of the Health Sciences, Bethesda, Md; Diagnostic Radiology Department (V.B.H., M.N.H.), Warren G. Magnuson Clinical Center, National Institutes of Health, Bethesda, Md; and Developmental Endocrinology Branch (V.K.B., M.C., P.L.V., C.A.B.), National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Md.