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Lei C, Niu XL, Wei J, Zhu JH, Zhu Y.Lei C, et al.Zhonghua Yu Fang Yi Xue Za Zhi. 2010 Jul;44(7):617-21.Zhonghua Yu Fang Yi Xue Za Zhi. 2010.PMID: 21055077Chinese.
Sun YX, Zhu YH, Zhu JH, Niu XL, Yan C, Yang G, Lin L.Sun YX, et al.Sichuan Da Xue Xue Bao Yi Xue Ban. 2013 May;44(3):388-92.Sichuan Da Xue Xue Bao Yi Xue Ban. 2013.PMID: 23898519Chinese.
Wei J, Niu XL, Dong X, Wang YP, Zhu JH.Wei J, et al. Among authors: niu xl.Zhonghua Yi Xue Yi Chuan Xue Za Zhi. 2007 Feb;24(1):91-3.Zhonghua Yi Xue Yi Chuan Xue Za Zhi. 2007.PMID: 17285554Chinese.
Zhu Y, Lai B, Niu X, Wei J, Tan W, Wang X.Zhu Y, et al. Among authors: niu x.J Epidemiol. 2014;24(5):385-91. doi: 10.2188/jea.je20130180. Epub 2014 Jun 28.J Epidemiol. 2014.PMID: 24975014Free PMC article.
Zhang MJ, Yang J, Zhu CZ, Duan ZM, Niu XL, Wang R, Song YF.Zhang MJ, et al.Sichuan Da Xue Xue Bao Yi Xue Ban. 2009 Mar;40(2):203-7.Sichuan Da Xue Xue Bao Yi Xue Ban. 2009.PMID: 19462890Chinese.