1. Division of Cardiovascular Medicine, Brigham and Women's Hospital, Boston, MA
2. Harvard Medical School, Boston, MA
3. National Heart, Lung and Blood Institute's Framingham Heart Study, Framingham, MA
4. Department of Mathematics and Statistics, Boston University, Boston, MA
5. Department of Radiology, Massachusetts General Hospital, Boston, MA
6. Department of Medicine, Section of General Internal Medicine, Boston University School of Medicine, Boston, MA
7. Division of Intramural Research and the Center for Population Studies, National Heart, Lung, and Blood Institute, Framingham, MA
8. Division of Endocrinology, Metabolism and Hypertension, Brigham and Women's Hospital and Harvard Medical School, Boston, MA