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Yousfi MM, El-Zimaity HM, Cole RA, Genta RM, Graham DY.Yousfi MM, et al. Among authors: cole ra.Gastrointest Endosc. 1996 Mar;43(3):222-4. doi: 10.1016/s0016-5107(96)70320-6.Gastrointest Endosc. 1996.PMID: 8857138