1 Richard C. Palmer and Deborah Ismond are with the Office of Extramural Research Administration, National Institute on Minority Health and Health Disparities (NIMHD), National Institutes of Health (NIH), Bethesda, MD. Erik J. Rodriquez is with the Division of Intramural Research; National Heart, Lung, and Blood Institute; Bethesda. Jay S. Kaufman is with the Department of Epidemiology, Biostatistics, and Occupational Health, McGill University, Montreal, Quebec. Richard C. Palmer is also a Guest Editor for this supplement issue.