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Bouwense SA, de Vries M, Schreuder LT, Olesen SS, Frøkjær JB, Drewes AM, van Goor H, Wilder-Smith OH.Bouwense SA, et al.World J Gastroenterol. 2015 Jan 7;21(1):47-59. doi: 10.3748/wjg.v21.i1.47.World J Gastroenterol. 2015.PMID: 25574079Free PMC article.Review.