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Crane M, Visvanathan K, Lewin SR.Crane M, et al. Among authors: lewin sr.Gastroenterol Res Pract. 2012;2012:473925. doi: 10.1155/2012/473925. Epub 2012 Feb 22.Gastroenterol Res Pract. 2012.PMID: 22474436Free PMC article.