1. From the Departments of Medicine and Pharmacology, Office of Personalized Medicine, Vanderbilt University School of Medicine. Nashville, Tenn (D.M.R.); Division of Endocrinology, Diabetes and Nutrition, Department of Medicine, University of Maryland School of Medicine, Baltimore, Md (A.R.S.); and Geriatric Research and Education Clinical Center, Veterans Administration Medical Center, Baltimore, Md (A.R.S.).