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Sopeña F, Lanas A, Sáinz R.Sopeña F, et al. Among authors: lanas a.J Clin Gastroenterol. 1998 Dec;27(4):316-20. doi: 10.1097/00004836-199812000-00007.J Clin Gastroenterol. 1998.PMID: 9855260
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