1. National Institute of Diabetes and Digestive and Kidney Diseases, Biomedical Medical and Imaging Branch (K.Z.A., J.E., N.S., J.M., L.B., W.Q., A.M.G.), National Institutes of Health, Bethesda, MD.
2. Diabetes Endocrinology and Obesity Branch (K.B., A.V., S.D., A.C., M.S., L.M., S.T.C.), National Institutes of Health, Bethesda, MD.
3. Hypertension in Africa Research Team (A.W.), North-West University, Potchefstroom.
4. South African Medical Research Council, Unit for Hypertension and Cardiovascular Disease (A.W.), North-West University, Potchefstroom.
5. Clinical Center (C.H.), National Institutes of Health, Bethesda, MD.