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Laffón A, Moreno A, Gutierrez-Bucero A, Ossorio C, Sabando P, Moreno-Otero R.Laffón A, et al.J Clin Gastroenterol. 1989 Dec;11(6):653-7. doi: 10.1097/00004836-198912000-00011.J Clin Gastroenterol. 1989.PMID: 2584665