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Jiang F, Wang X, Zhu F, Zeng L, Wang X, Li H, Shen Z, Yang K, Zhang Z.Jiang F, et al.Zhong Nan Da Xue Xue Bao Yi Xue Ban. 2014 Mar;39(3):245-51. doi: 10.11817/j.issn.1672-7347.2014.03.004.Zhong Nan Da Xue Xue Bao Yi Xue Ban. 2014.PMID: 24748198Free article.Chinese.
Liu Z, Shen L, Huang W, Zhao X, Fang W, Wang C, Yin Z, Wang J, Fu G, Liu X, Jiang J, Zhang Z, Li J, Lu Y, Ge J.Liu Z, et al.BMJ Open. 2017 Sep 1;7(9):e015672. doi: 10.1136/bmjopen-2016-015672.BMJ Open. 2017.PMID: 28864691Free PMC article.Clinical Trial.