1. Departments of Internal Medicine-Hypertension Section (H.-K.K., Z.W., U.B.P., W.V.), University of Texas Southwestern Medical Center, Dallas, TX.
2. Applied Clinical Research (H.-K.K., R.I., A.F., S.A.S., M.M.), University of Texas Southwestern Medical Center, Dallas, TX.
3. Internal Medicine-Renal Division (M.C.H.), University of Texas Southwestern Medical Center, Dallas, TX.
4. Pak Center of Mineral Metabolism and Clinical Research (M.C.H., W.V.), University of Texas Southwestern Medical Center, Dallas, TX.