Preoperative chemoradiotherapy in older patients with rectal cancer guided by comprehensive geriatric assessment within a multidisciplinary team—a multicenter phase II trial oleh Wen-Yang Liu, Yuan Tang, Ning Li, Yu Tang, Yun-Jie Cheng, Lin Yang, Hui Fang, Ning-Ning Lu, Shu-Nan Qi, Bo Chen, Shu-Lian Wang, Yong-Wen Song, Yue-Ping Liu, Ye-Xiong Li, Zheng Liu, Jian-Wei Liang, Wei Pei, Xi-Shan Wang, Hai-Zeng Zhang, Jun Wang, Hai-Tao Zhou, Jing Jin