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Ma Y, He M, Hou LS, Xu S, Huang ZX, Zhao N, Kang Y, Yue JR, Wu C.Ma Y, et al. Among authors: hou ls.BMC Geriatr. 2021 Jun 10;21(1):355. doi: 10.1186/s12877-021-02310-x.BMC Geriatr. 2021.PMID: 34112103Free PMC article.