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*Associated with ''[[sclerosing cholangitis]]''. | *Associated with ''[[sclerosing cholangitis]]''. | ||
*Appendicitis is considered protective against UC.<ref name=pmid19685454>{{Cite journal | last1 = Beaugerie | first1 = L. | last2 = Sokol | first2 = H. | title = Appendicitis, not appendectomy, is protective against ulcerative colitis, both in the general population and first-degree relatives of patients with IBD. | journal = Inflamm Bowel Dis | volume = | issue = | pages = | month = Aug | year = 2009 | doi = 10.1002/ibd.21064 | PMID = 19685454 }}</ref><ref name=pmid19273505>{{Cite journal | last1 = Timmer | first1 = A. | last2 = Obermeier | first2 = F. | title = Reduced risk of ulcerative colitis after appendicectomy. | journal = BMJ | volume = 338 | issue = | pages = b225 | month = | year = 2009 | doi = | PMID = 19273505 }}</ref> | *Appendicitis is considered protective against UC.<ref name=pmid19685454>{{Cite journal | last1 = Beaugerie | first1 = L. | last2 = Sokol | first2 = H. | title = Appendicitis, not appendectomy, is protective against ulcerative colitis, both in the general population and first-degree relatives of patients with IBD. | journal = Inflamm Bowel Dis | volume = | issue = | pages = | month = Aug | year = 2009 | doi = 10.1002/ibd.21064 | PMID = 19685454 }}</ref><ref name=pmid19273505>{{Cite journal | last1 = Timmer | first1 = A. | last2 = Obermeier | first2 = F. | title = Reduced risk of ulcerative colitis after appendicectomy. | journal = BMJ | volume = 338 | issue = | pages = b225 | month = | year = 2009 | doi = | PMID = 19273505 }}</ref> | ||
*Smoking is protective; the opposite is true for Crohn's disease.<ref name=pmid19273505/> | *[[Smoking]] is protective; the opposite is true for Crohn's disease.<ref name=pmid19273505/> | ||
===Gross=== | ===Gross=== |
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