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Chey WD, Wong BC; Practice Parameters Committee of the American College of Gastroenterology.Chey WD, et al.Am J Gastroenterol. 2007 Aug;102(8):1808-25. doi: 10.1111/j.1572-0241.2007.01393.x. Epub 2007 Jun 29.Am J Gastroenterol. 2007.PMID: 17608775Free article.