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Valenzuela JE, Kogut DG, McCullough AJ, Colón Pagán JR, Shah U, Whipple J, Gilde LR, Simon TJ.Valenzuela JE, et al. Among authors: kogut dg.Am J Gastroenterol. 1996 Dec;91(12):2516-22.Am J Gastroenterol. 1996.PMID: 8946978Clinical Trial.