1. From the Departments of Health Care Sciences (M.M., S.A.S.) and Internal Medicine (M.M., R.M.D., J.H.M., S.A.S., W.V.) and Hypertension Section, Cardiology Division (W.V.), University of Texas Southwestern Medical Center, Dallas; and Department of Internal Medicine, University of Michigan Medical School, Ann Arbor (R.J.A.).