Impact of impaired intrinsic capacity on postoperative frailty in elderly patients undergoing colorectal surgery: study protocol for a single-center, prospective, cohort study by Jirun Wang, Shaoqi Tian, Lei Zhang, Jia Liu, Yuefang Liu, Lei Zhu, Peipei Shan, Ping Zhao, Yang Zhao, Youzhuang Zhu, Youzhuang Zhu

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