1. Section on Endocrinology and Genetics, Program on Developmental Endocrinology and Genetics, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland.
2. Department of Radiology, Demokritus University of Thrace, Alexandroupolis, Greece.
3. Department of Diagnostic Radiology, National Institutes of Health Clinical Research Center, Bethesda, Maryland.
4. National Cancer Institute, Laboratory of Pathology, Bethesda, Maryland.
5. Department of Laboratory Medicine, Mayo Clinic, Rochester, Minnesota.