1. Diabetes, Endocrinology, and Obesity Branch, National Institute of Diabetes, Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland.
2. Nutrition Department of the Clinical Center, National Institutes of Health, Bethesda, Maryland.
3. Radiology Department of the Clinical Center, National Institutes of Health, Bethesda, Maryland.
4. Pennington Biomedical Research Center, Louisiana State University System, Baton Rouge, Louisiana.