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Roberts WG, Simon TJ, Berlin RG, Haggitt RC, Snyder ES, Stenson WF, Hanauer SB, Reagan JE, Cagliola A, Tanaka WK, Simon S, Berger ML.Roberts WG, et al. Among authors: hanauer sb.Gastroenterology. 1997 Mar;112(3):725-32. doi: 10.1053/gast.1997.v112.pm9041233.Gastroenterology. 1997.PMID: 9041233Clinical Trial.