Effect of bladder filling status on positioning errors in post-hysterectomy cervical cancer radiotherapy oleh Bin-Bin Ge, Yu Liu, Jian-Hua Jin, Jian-Ting Wu, Hai-Tao Liu, Chen-Yun He, Yong-Liang Zhao, Gu-Fei Cao, Xiao-Gang Zhai, Kai-Yue Chu, Jun-Hui Wang