1. National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland
2. National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland
3. National Human Genome Research Institute, National Institutes of Health, Bethesda, Maryland
4. Department of Laboratory Medicine, National Institutes of Health, Bethesda, Maryland
5. Children’s National Rare Disease Institute, Children’s National Medical Center, Washington, DC
6. National Cancer Institute, National Institutes of Health, Bethesda, Maryland
7. Endocrine Section, Medstar Washington Hospital Center, Washington, DC