1. Department of Environmental Health, Harvard School of Public Health, Boston, Massachusetts, USA
2. Cardiovascular Epidemiology Research Unit, Beth Israel Deaconess Medical Center, Boston, Massachusetts, USA
3. Center of Molecular and Genetic Epidemiology, Department of Environmental and Occupational Health, Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico e Università degli Studi di Milano, Milan, Italy
4. VA Normative Aging Study, Veterans Affairs Boston Healthcare System and the Department of Medicine, Boston University School of Medicine, Boston, Massachusetts, USA
5. Channing Laboratory, Brigham and Women’s Hospital, Boston, Massachusetts, USA