Construction and validation of a risk prediction model for postoperative frailty in older adults:a multicenter study by Shilong Lu, Hao Liang, Jiamin Fang, Rui Chen, Huilian Liao, Mingming Xu, Yumei Chen, Huijin Sun, Lijuan Dong, Yingui Guo, Zhixia Jiang, Hui Xiao, Lin Wei

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