1. From the Division of Preventive Medicine, Department of Medicine (LW, JMG, JEB, and HDS) and the Division of Aging, Department of Medicine (JMG, JEB, and HDS), Brigham and Women's Hospital, Boston, MA; Our Lady of Mercy Medical Center, Bronx, NY (EPN); and the Department of Epidemiology, Harvard School of Public Health, Boston, MA (JEB)