title: [Bibliographical study on international comparison of the frequency of ulcerative colitis and Crohn's disease].
authors: K
authors: K
authors: Nakamura
mesh_terms: D003093:Colitis, Ulcerative / Q000453:epidemiology*; D003424:Crohn Disease / Q000453:epidemiology*; D006801:Humans; D007564:Japan / Q000453:epidemiology; D013548:Sweden / Q000453:epidemiology; D006113:United Kingdom / Q000453:epidemiology; D014481:United States / Q000453:epidemiology