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Wolf A, Burnat P, Garcia-Hejl C, Ceppa F.Wolf A, et al. Among authors: ceppa f.Gastroenterol Clin Biol. 2009 Mar;33(3):176-84. doi: 10.1016/j.gcb.2008.10.014. Epub 2009 Feb 24.Gastroenterol Clin Biol. 2009.PMID: 19243907Free article.French.