title: Appendicitis, not appendectomy, is protective against ulcerative colitis, both in the general population and first-degree relatives of patients with IBD.
authors.affiliation: Department of Gastroenterology, AP-HP Hôpital Saint-Antoine, UPMC University of Paris, Paris, France.
authors.forename: Laurent
authors.initials: L
authors.lastname: Beaugerie
authors.forename: Harry
authors.initials: H
authors.lastname: Sokol