1. Framingham Heart Study, Framingham, MA
2. Cardiology Division, Department of Medicine, Massachusetts General Hospital Harvard Medical School, Boston, MA
3. Cardiovascular Engineering, Inc, Norwood, MA
4. Department of Biology, Vassar College, Poughkeepsie, NY
5. Department of Epidemiology, Boston University School of Public Health, Boston, MA
6. Section of Preventive Medicine, Department of Medicine, Boston University School of Medicine, Boston, MA
7. Department of Biostatistics, Boston University School of Public Health, Boston, MA
8. Cardiology Section, Department of Medicine, Boston University School of Public Health, Boston, MA
9. Cardiovascular Division, Veterans Administration Hospital, West Roxbury, MA
10. Harvard Medical School, Boston, MA