An MRI-based radiomics nomogram for preoperative prediction of Ki-67 index in nasopharyngeal carcinoma: a two-center study - Wang, Yao; Zhang, Jing; Li, Qiyuan; Sun, Li; Zheng, Yingmei; Gao, Chuanping; Dong, Cheng (Frontiers in Oncology, 2024)