1. National Heart, Lung and Blood Institute's Framingham Heart Study, Framingham, MA
2. Department of Endocrinology, Hypertension and Diabetes, Brigham and Women's Hospital and Harvard Medical School, Boston, MA
3. Department of Biostatistics, Boston University School of Public Health, Boston, MA
4. Department of Radiology, Massachusetts General Hospital and Harvard Medical School, Boston, MA
5. National Heart, Lung, and Blood Institute, Bethesda, MD