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Liu H, Shen Y, Sun L, Kuang X, Zhang R, Zhang H, Zhou J, Li X, Huang W.Liu H, et al.Zhonghua Er Ke Za Zhi. 2014 Jul;52(7):494-9.Zhonghua Er Ke Za Zhi. 2014.PMID: 25224052Chinese.
Sun L, Kuang X, Hao S, Wang P, Niu X, Zhu G, Zhou J, Huang W.Sun L, et al.Zhonghua Er Ke Za Zhi. 2015 Feb;53(2):114-8.Zhonghua Er Ke Za Zhi. 2015.PMID: 25876686Chinese.
Gao J, Wang F, Kuang X, Chen R, Rao J, Wang B, Li W, Liu H, Shen Q, Wang X, Xu H.Gao J, et al.Ann Saudi Med. 2016 Jul-Aug;36(4):252-7. doi: 10.5144/0256-4947.2016.252.Ann Saudi Med. 2016.PMID: 27478910Free PMC article.