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Mark DG, Rex DK, Lappas JC.Mark DG, et al. Among authors: rex dk.Gastrointest Endosc. 1992 Nov-Dec;38(6):693-5. doi: 10.1016/s0016-5107(92)70566-5.Gastrointest Endosc. 1992.PMID: 1473672Clinical Trial.