1. Division of Cardiology, Loyola University Health System, Maywood IL
2. National Heart, Lung, and Blood Institute's Framingham Heart Study, Framingham, MA
3. Department of Biostatistics
4. Department of Mathematics and Statistics, and
5. Sections of Preventive Medicine and Epidemiology and Cardiology, Boston University, Boston, MA
6. Division of Cardiology, Massachusetts General Hospital, Boston, MA
7. Division of Cardiovascular Medicine, Brigham and Women's Hospital, Boston, MA
8. Pulmonary Center, Department of Medicine, Boston University School of Medicine, Boston, MA