Construction of a survival prediction model for high-and low -grade UTUC after tumor resection based on "SEER database": a multicenter study. - Wang, Mengmeng; Ren, Xin; Wang, Ge; Sun, Xiaomin; Tang, Shifeng; Zhang, Baogang; Xing, Xiaoming; Zhang, Wenfeng; Gao, Guojun; Du, Jing; Zhang, Shukun; Liu, Lijuan; et al. (BMC Cancer, 2021)