作者单位:National Institutes of Child Health Development, National Institutes of Health, Bethesda, MD[1]National Institute of Diabetes and Digestive and Kidney Diseases, Diabetes, Endocrine, and Obesity[2]Clinical Center, National Institutes of Health, Bethesda, MD, United States[3]National Cancer Institute, National Institutes of Health, Bethesda, MD, United States[4]