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Williet N, Paul S, Peyrin-Biroulet L, Roblin X.Williet N, et al.Dig Dis Sci. 2016 Apr;61(4):990-5. doi: 10.1007/s10620-015-3984-2. Epub 2015 Dec 15.Dig Dis Sci. 2016.PMID: 26669880Review.