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Sostres C, Lanas A.Sostres C, et al.Gastrointest Endosc Clin N Am. 2011 Oct;21(4):567-81. doi: 10.1016/j.giec.2011.07.004. Epub 2011 Aug 10.Gastrointest Endosc Clin N Am. 2011.PMID: 21944411Review.