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Schnitzler F, Fidder H, Ferrante M, Noman M, Arijs I, Van Assche G, Hoffman I, Van Steen K, Vermeire S, Rutgeerts P.Schnitzler F, et al. Among authors: van steen k, van assche g.Gut. 2009 Apr;58(4):492-500. doi: 10.1136/gut.2008.155812. Epub 2008 Oct 2.Gut. 2009.PMID: 18832518Clinical Trial.