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Chak A, Faulx A, Davessar N, Willis J.Chak A, et al.Gastrointest Endosc. 2004 Oct;60(4):601-2. doi: 10.1016/s0016-5107(04)01870-x.Gastrointest Endosc. 2004.PMID: 15472688No abstract available.