1. Department of Pharmacology, Chengde Medical University, Chengde, Hebei 067000, P.R. China
2. Department of Pathology, Chengde Medical University, Chengde, Hebei 067000, P.R. China
3. Research Laboratory, Chengde Medical University, Chengde, Hebei 067000, P.R. China
4. Department of Tumor Radiation and Chemotherapy Center, Chengde Central Hospital, Chengde, Hebei 067000, P.R. China
5. Department of Gynaecology, Chengde Central Hospital, Chengde, Hebei 067000, P.R. China