Polychlorinated biphenyls, cytochrome P450 1A1 (CYP1A1) polymorphisms, and breast cancer risk among African American women and white women in North Carolina: A population-based case-control study - Li, Y; Millikan, R C; Bell, D A; Cui, L; Tse, C K; Newman, B; Conway, K (Breast Cancer Res, 2005)