1. Mel and Enid Zuckerman College of Public Health, University of Arizona, Tucson, Arizona.
2. Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Bethesda, Maryland.
3. Arizona Cancer Center, University of Arizona, Tucson, Arizona.
4. Mexican-American Studies and Research Center, University of Arizona, Tucson, Arizona.
5. Center of Excellence in Women's Health, University of Arizona, Tucson, Arizona.