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Tetzlaff JE, Maurer WG.Tetzlaff JE, et al.Gastrointest Endosc Clin N Am. 2016 Jul;26(3):433-41. doi: 10.1016/j.giec.2016.02.001.Gastrointest Endosc Clin N Am. 2016.PMID: 27372768Review.