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Joseph DA, DeGroff AS, Hayes NS, Wong FL, Plescia M.Joseph DA, et al. Among authors: degroff as.Gastrointest Endosc. 2011 Mar;73(3):429-34. doi: 10.1016/j.gie.2010.12.027.Gastrointest Endosc. 2011.PMID: 21353839No abstract available.