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Ito Y, Blackstone MO, Riddell RH, Kirsner JB.Ito Y, et al. Among authors: blackstone mo.Gastrointest Endosc. 1979 Aug;25(3):96-101. doi: 10.1016/s0016-5107(79)73384-0.Gastrointest Endosc. 1979.PMID: 499733No abstract available.