1. Framingham Heart Study; Framingham MA USA
2. Division of Cardiovascular Medicine, Department of Medicine; Brigham and Women's Hospital; Boston MA USA
3. Department of Mathematics and Statistics; Boston University; Boston MA USA
4. Department of Biostatistics; Boston University School of Public Health; Boston MA USA
5. Department of Neurology; Boston University School of Medicine; Boston MA USA
6. Veterans Administration Hospital; West Roxbury MA USA
7. Whitaker Cardiovascular Institute, Preventive Medicine and Cardiology Sections; Boston University School of Medicine; Boston MA USA
8. Department of Epidemiology; Boston University School of Public Health; Boston MA USA