title: Appendectomy and ulcerative colitis.
authors.forename: Morten
authors.initials: M
authors.lastname: Frisch
authors.forename: Claus
authors.initials: C
authors.lastname: Rostgaard
mesh_terms: D000328:Adult; D000367:Age Factors; D001062:Appendectomy; D003093:Colitis, Ulcerative / Q000209:etiology / Q000601:surgery*; D003106:Colon / Q000601:surgery; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D012307:Risk Factors