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Leedham SJ, Graham TA, Oukrif D, McDonald SA, Rodriguez-Justo M, Harrison RF, Shepherd NA, Novelli MR, Jankowski JA, Wright NA.Leedham SJ, et al. Among authors: shepherd na.Gastroenterology. 2009 Feb;136(2):542-50.e6. doi: 10.1053/j.gastro.2008.10.086. Epub 2008 Nov 7.Gastroenterology. 2009.PMID: 19103203