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Ponz E, García-Pagán JC, Bruguera M, Bruix J, Rodés J.Ponz E, et al. Among authors: rodes j.Gastroenterology. 1991 Jan;100(1):268-70. doi: 10.1016/0016-5085(91)90612-o.Gastroenterology. 1991.PMID: 1983832