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Gilbert DA, Surawicz CM, Silverstein FE, Weinberg CR, Saunders DR, Feld AD, Sanford RL, Bergman D, Washington P.Gilbert DA, et al. Among authors: silverstein fe.Gastroenterology. 1984 Feb;86(2):339-45.Gastroenterology. 1984.PMID: 6360786Clinical Trial.