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Johnson GK, Geenen JE, Bedford RA, Johanson J, Cass O, Sherman S, Hogan WJ, Ryan M, Silverman W, Edmundowicz S, et al.Johnson GK, et al. Among authors: hogan wj.Gastrointest Endosc. 1995 Oct;42(4):312-6. doi: 10.1016/s0016-5107(95)70128-1.Gastrointest Endosc. 1995.PMID: 8536898Clinical Trial.