1. Department of Tumor Radiotherapy, The Second Hospital of Jilin University, Changchun, Jilin 130041, P.R. China
2. Department of Gynaecology, The Second Hospital of Jilin University, Changchun, Jilin 130041, P.R. China
3. Department of Pathology, The Second Hospital of Jilin University, Changchun, Jilin 130041, P.R. China