Affiliation: | 1. Geriatric Research, Education, and Clinical Center, Veterans Affairs Medical Center, , Durham, North Carolina;2. Center for Health Services Research and Development, Veterans Affairs Medical Center, , Durham, North Carolina;3. Department of Medicine, Duke University, , Durham, North Carolina;4. Claude D. Pepper Center/Aging Center, Duke University, , Durham, North Carolina;5. Department of Biostatistics and Bioinformatics, Duke University, , Durham, North Carolina;6. Endocrinology Section, Veterans Affairs Medical Center, , Durham, North Carolina;7. Clinical Research Institute, Duke University, , Durham, North Carolina;8. Barshop Institute for Longevity and Aging Studies, University of Texas Health Science Center, , San Antonio, Texas;9. Physical Medicine and Rehabilitation Service, Veterans Affairs Medical Center, , Durham, North Carolina;10. Department of Physical Therapy, University of New England, , Portland, Maine;11. Departments of Genetics and Microbiology, Duke University, , Durham, North Carolina;12. Immunology, Duke University, , Durham, North Carolina |