In this cross-sectional study conducted from March 2004 through August 2006, bilingual (English and Spanish) and bicultural female interviewers recruited women from the postpartum wards at 2 health care facilities in northern California: the Kaiser Permanente Medical Center in Walnut Creek (KP-WC), which is part of a group-model integrated health care delivery system, and San Francisco General Hospital (SFGH), the only public hospital in San Francisco County.