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Gordon A, Hobbs DA, Bowden DS, Bailey MJ, Mitchell J, Francis AJ, Roberts SK.Gordon A, et al. Among authors: roberts sk.J Gastroenterol Hepatol. 2006 Jan;21(1 Pt 2):275-80. doi: 10.1111/j.1440-1746.2006.04138.x.J Gastroenterol Hepatol. 2006.PMID: 16460486Clinical Trial.