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Rex DK, Johnson DA, Anderson JC, Schoenfeld PS, Burke CA, Inadomi JM; American College of Gastroenterology.Rex DK, et al.Am J Gastroenterol. 2009 Mar;104(3):739-50. doi: 10.1038/ajg.2009.104. Epub 2009 Feb 24.Am J Gastroenterol. 2009.PMID: 19240699