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Norman A, Hawkey CJ.Norman A, et al. Among authors: hawkey cj.Frontline Gastroenterol. 2011 Oct;2(4):199-205. doi: 10.1136/flgastro-2011-100006. Epub 2011 Jun 24.Frontline Gastroenterol. 2011.PMID: 28839610Free PMC article.