1. From the Division of Epidemiology and Clinical Applications, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD; the Endocrine-Hypertension Division, Brigham & Women's Hospital, Harvard Medical School, Boston; Kaiser Permanente, Center for Health Research, Portland, OR; the Pennington Biomedical Research Center, Louisiana State University, Baton Rouge; the Welc