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Liu J, Wan R, Xu XF, Wang XP, Yang WJ, Xia YJ, Liu H, Yan QL, Yan DX, Guo CY.Liu J, et al. Among authors: xu xf.World J Gastroenterol. 2009 Apr 28;15(16):2009-15. doi: 10.3748/wjg.15.2009.World J Gastroenterol. 2009.PMID: 19399935Free PMC article.
Xu L, Wang F, Liu H, Xu XF, Mo WH, Xia YJ, Wan R, Wang XP, Guo CY.Xu L, et al. Among authors: xu xf.Dig Dis Sci. 2011 Jun;56(6):1645-55. doi: 10.1007/s10620-010-1510-0. Epub 2010 Dec 4.Dig Dis Sci. 2011.PMID: 21132365
Lu J, Guo CY, Xu XF, Wang XP, Wan R.Lu J, et al. Among authors: xu xf.World J Gastroenterol. 2012 Jan 21;18(3):275-8. doi: 10.3748/wjg.v18.i3.275.World J Gastroenterol. 2012.PMID: 22294831Free PMC article.
Zhou YQ, Xu L, Wang BF, Fan XM, Wu JY, Wang CY, Guo CY, Xu XF.Zhou YQ, et al. Among authors: xu l, xu xf.Gastroenterol Res Pract. 2012;2012:405425. doi: 10.1155/2012/405425. Epub 2011 Nov 21.Gastroenterol Res Pract. 2012.PMID: 22550478Free PMC article.