1. From the Sticht Center on Aging (JD and SBK), and Division of Public Health Science (F-CH and GLB), Wake Forest University School of Medicine, Winston-Salem, NC; Laboratory of Epidemiology, Demography, and Biometry, National Institute on Aging, Bethesda, MD (TBH); Division of Cardiology, Los Angeles Biomedical Research Institute, Torrance, CA (RCD); Department of Epidemiology, The Johns Hopkins B