1. Center for Regenerative Medicine, Massachusetts General Hospital, Harvard Medical School, Boston, MA;
2. Section of Hematology/Oncology, University of Chicago Medical Center, Chicago, IL;
3. Cardiology Division, Massachusetts General Hospital, Harvard Medical School, Boston, MA;
4. Framingham Heart Study, Framingham, MA;
5. Division of Cardiovascular Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA;
6. Department of Mathematics and Statistics, Boston University, Boston, MA;
7. Department of Biostatistics, Boston University School of Public Health, Boston, MA;
8. Genzyme Corporation, Cambridge, MA;
9. Bioengineering Department, Harvard University, Boston, MA;
10. Department of Medicine, Massachusetts General Hospital, Harvard Medical School, Boston, MA;
11. Center for Population Studies, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD;
12. Preventive Medicine and Cardiology Sections, Department of Medicine, Boston University School of Medicine, Boston, MA; and
13. Center for Systems Biology, Massachusetts General Hospital, Harvard Medical School, Boston, MA