1. Framingham Heart Study of the National Heart, Lung and Blood Institute Boston University School of Medicine, Framingham, MA
2. Cardiovascular Medicine Section, Department of Medicine, Boston University School of Medicine, Boston, MA
3. Department of Mathematics and Statistics, Boston University, Boston, MA
4. Division of Cardiology, Department of Medicine, Massachusetts General Hospital, Boston, MA
5. Division of Cardiology, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA
6. Loyola University Health System, Chicago, IL
7. Cardiology and Preventive Medicine, Department of Medicine, Boston University School of Medicine, Boston, MA
8. Cardiovascular Medicine Division, Department of Medicine, Vanderbilt University, Nashville, TN