The Black Women's Health Study (BWHS) is a long-term observational study conducted at Boston University's Slone Epidemiology Center since 1995 to investigate the health problems of black women over a long period, with the ultimate goal of improving their health. Gaining information about the causes of health problems that affect black women will help to determine health outcomes. The study, funded by the National Institutes of Health, follows a cohort of the 59,000 women that enrolled.