Etiology of inflammatory bowel disease.
D003092:Colitis / Q000453:epidemiology / Q000209:etiology*; D003093:Colitis, Ulcerative / Q000209:etiology; D003110:Colonic Neoplasms / Q000209:etiology; D003424:Crohn Disease / Q000209:etiology; D004777:Environment; D005006:Ethnicity; D006801:Humans