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Waterman M, Gralnek IM.Waterman M, et al. Among authors: gralnek im.Gastrointest Endosc Clin N Am. 2007 Jan;17(1):157-67, viii. doi: 10.1016/j.giec.2006.10.005.Gastrointest Endosc Clin N Am. 2007.PMID: 17397782Review.