1. Intramural Research Program, National Institute of Neurological and Communicative Disorders and Stroke, Bethesda, Maryland 20892, U.S.A., 20 January 1987
2. Hypertension–Endocrine Branch, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, Maryland 20892, U.S.A., 20 January 1987