Robot-assisted partial nephrectomy: Can retroperitoneal approach suit for renal tumors of all locations?—A large retrospective cohort study oleh Xiangjun Lyu, Zhuo Jia, Liyan Ao, Changhao Ren, Yangyang Wu, Yunlai Xu, Ke Chen, Yu Gao, Baojun Wang, Xin Ma, Xu Zhang