Center for Disease Control and Prevention in Tangshan City;
Tangshan;
China;
Center for Disease Control and Prevention in Yutian County;
Tangshan;
China;
Medical College;
Hubei Arts and Sciences University;
Xiangyang;
China;
School of Public Health;
Hebei Union University;
Tangshan;
China;
Xingtai Medical Higher Junior College;
Xingtai;
China;
Breast; Cancer; DDT; HCH; Glutathione; S-Transferase; M1; (GSTM1); Endocrine; Disruptors; Gene; Polymorphism; Interaction;