MRI-detected residual retropharyngeal lymph node after intensity-modulated radiotherapy in nasopharyngeal carcinoma: Prognostic value and a nomogram for the pretherapy prediction of it

Wang‐Zhong Li, Guoying Liu, Lan-Feng Lin, Shu‐Hui Lv, Meng‐Yun Qiang, Xing Lv, Yi‐Shan Wu, Hu L, Liang‐Ru Ke, De‐Ling Wang, Ya‐Hui Yu, Wen‐Ze Qiu, Kui-Yuan Liu, Xiang Guo, Jianpeng Li, Yujian Zou, Yan‐Qun Xiang, Wei‐Xiong Xia