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Wong RK, Maydonovitch C, Garcia JE, Johnson LF, Castell DO.Wong RK, et al.J Clin Gastroenterol. 1987 Aug;9(4):386-9. doi: 10.1097/00004836-198708000-00006.J Clin Gastroenterol. 1987.PMID: 3116071Clinical Trial.