1. Department of Epidemiology, and
2. Department of Environmental Health, Harvard School of Public Health, Boston, Massachusetts, USA
3. Cardiovascular Epidemiology Research Unit, Beth Israel Deaconess Medical Center, Boston, Massachusetts, USA
4. Department of Pediatrics, Children’s Hospital Boston, Harvard Medical School, Boston, Massachusetts; USA
5. Veterans Administration Normative Aging Study, VA Boston Healthcare System and Department of Medicine, Boston University School of Medicine, Boston, Massachusetts, USA
6. Channing Laboratory, Brigham and Women’s Hospital, Harvard Medical School, Boston, Massachusetts, USA
7. Center of Molecular and Genetic Epidemiology, Istituto Di Ricovero e Cura a Carattere Scientifico, Ca’ Granda Maggiore Policlinico Hospital Foundation and Department of Environmental and Occupational Health, University of Milan, Milan, Italy