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Ding F, Feng XH, Meng HX, Zhao YB, Zhang L, Lu RF, Chen ZB.Ding F, et al.Beijing Da Xue Xue Bao Yi Xue Ban. 2008 Jun 18;40(3):318-22.Beijing Da Xue Xue Bao Yi Xue Ban. 2008.PMID: 18560463Free article.Chinese.
Feng XH, Zhang L, Meng HX, Xu L, Chen ZB, Shi D, Lu RF.Feng XH, et al.Beijing Da Xue Xue Bao Yi Xue Ban. 2009 Feb 18;41(1):44-8.Beijing Da Xue Xue Bao Yi Xue Ban. 2009.PMID: 19221563Free article.Chinese.
Liu KN, Meng HX, Tang XL, Xu L, Zhang L, Chen ZB, Shi D, Feng XH, Lu RF.Liu KN, et al.Beijing Da Xue Xue Bao Yi Xue Ban. 2009 Feb 18;41(1):49-51.Beijing Da Xue Xue Bao Yi Xue Ban. 2009.PMID: 19221564Free article.Chinese.