1. Division of Endocrinology, Metabolism, and Nutrition; Department of Medicine; Duke University Medical Center; School of Medicine; Durham North Carolina
2. Center for the Study of Aging and Human Development; School of Medicine; Durham North Carolina
3. Geriatric Research Education and Clinical Center; Durham Veterans Affairs Medical Center; Durham North Carolina
4. Department of Biostatistics and Bioinformatics; Duke University Medical Center; School of Medicine; Durham North Carolina
5. Division of Geriatrics; Department of Medicine; Duke University Medical Center; Durham North Carolina