1. Framingham Heart Study, Framingham, MA
2. Institute of Epidemiology, Christian Albrechts University Kiel, Kiel, Germany
3. Sections of Preventive Medicine and Cardiology, Boston University School of Medicine, Boston, MA
4. Department of Biostatistics, Boston University School of Public Health, Boston, MA
5. Department of Epidemiology, Boston University School of Public Health, Boston, MA