title: Inverse association between appendectomy and ulcerative colitis.
authors.forename: Roland E B
authors.initials: RE
authors.lastname: Andersson
mesh_terms: D000328:Adult; D000367:Age Factors; D001062:Appendectomy; D003093:Colitis, Ulcerative / Q000453:epidemiology*; D006801:Humans; D015994:Incidence; D011184:Postoperative Period; D013548:Sweden