1. Departments of Internal Medicine (D.V.M., D.A., Z.W., R.J.A., W.V.), University of Texas Southwestern Medical Center, Dallas, Texas 75390
2. Clinical Sciences (B.A.-H.), University of Texas Southwestern Medical Center, Dallas, Texas 75390
3. Donald W. Reynolds Cardiovascular Clinical Research Center (W.V.), University of Texas Southwestern Medical Center, Dallas, Texas 75390