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Narula N, Marshall JK.Narula N, et al. Among authors: marshall jk.J Crohns Colitis. 2012 May;6(4):397-404. doi: 10.1016/j.crohns.2011.10.015. Epub 2011 Nov 25.J Crohns Colitis. 2012.PMID: 22398052Review.