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Megraud F, Coenen S, Versporten A, Kist M, Lopez-Brea M, Hirschl AM, Andersen LP, Goossens H, Glupczynski Y; Study Group participants.Megraud F, et al. Among authors: hirschl am.Gut. 2013 Jan;62(1):34-42. doi: 10.1136/gutjnl-2012-302254. Epub 2012 May 12.Gut. 2013.PMID: 22580412