Institution: | 1. Division of Endocrinology, Diabetes and Nutrition, Department of Medicine, University of Maryland School of Medicine, Baltimore, Maryland, USA;2. Medical School of Nanjing University, Nanjing, China;3. Department of Surgery, University of Maryland School of Medicine, Baltimore, Maryland, USA;4. VA Research Service, Geriatric Research, Education and Clinical Center, Baltimore Veterans Administration Medical Center, Baltimore, Maryland, USA |