1. Department of Environmental Health, Harvard School of Public Health, Boston, Massachusetts, USA
2. Center of Molecular Epidemiology and Genetics; and EPOCA Epidemiology Research Center, University of Milan and IRCCS Maggiore Hospital, Mangiagalli and Regina Elena Foundation, Milan, Italy
3. Channing Laboratory, Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School, Boston, Massachusetts, USA
4. VA Normative Aging Study, Veterans Affairs Boston Healthcare System and the Department of Medicine, Boston University School of Medicine, Boston, Massachusetts, USA