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Siegel CA, Melmed GY, McGovern DP, Rai V, Krammer F, Rubin DT, Abreu MT, Dubinsky MC; International Organization for the Study of Inflammatory Bowel Disease (IOIBD); International Organization for the Study of Inflammatory Bowel Diseases (IOIBD).Siegel CA, et al. Among authors: rubin dt.Gut. 2021 Apr;70(4):635-640. doi: 10.1136/gutjnl-2020-324000. Epub 2021 Jan 20.Gut. 2021.PMID: 33472895Free PMC article.No abstract available.