A retrospective dosimetry study of intensity-modulated radiotherapy for nasopharyngeal carcinoma: radiation-induced brainstem injury and dose-volume analysis oleh Cheng-Yun Yao, Guo-Ren Zhou, Li-Jun Wang, Jian-Hua Xu, Jin-jun Ye, Lan-Fang Zhang, Xia He, Zhen-Zhang Chen, Sheng-Fu Huang