1. Harvard School of Public Health, Department of Epidemiology, 665 Huntington Ave, Boston, MA
2. Brigham and Women's Hospital and Harvard Medical School, and Harvard School of Public Health, Departments of Epidemiology and Nutrition, Channing Laboratory, 665 Huntington Ave, Boston, MA
3. Brigham and Women's Hospital and Harvard Medical School, Division of Cardiovascular Medicine and Channing Laboratory, and Harvard School of Public Health, Departments of Epidemiology and Nutrition, 665 Huntington Ave, Boston, MA