Social isolation in relation to the incidence and dynamic progression of frailty in the oldest old: a trajectory analysis of a nationwide cohort by Junyi Wang, Yafu Yu, Lang Xu, Xinyan Xie, Xiaochang Liu, Juan Zhou, Guirong Cheng, Feifei Hu, Dan Liu, Linya Huang, Gangbin Han, Shiyue Li, Dan Song, Jing Liu, Qianqian Nie, Cheng Cai, Yuyang Cui, Wei Tan, Yan Zeng

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