1. National Heart, Lung, and Blood Institute's Framingham Heart Study, Framingham, Massachusetts
2. National Heart, Lung, and Blood Institute, Bethesda, Maryland
3. Division of Endocrinology, Metabolism, and Hypertension, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts
4. Boston University Department of Mathematics, Boston, Massachusetts
5. Department of Medicine, Emory University School of Medicine, Atlanta, Georgia
6. Boston University School of Medicine, Boston, Massachusetts