title: Nonspecific ulcerative colitis. I. Introduction.
mesh_terms: D003093:Colitis, Ulcerative / Q000175:diagnosis / Q000209:etiology / Q000628:therapy; D003424:Crohn Disease / Q000175:diagnosis; D003937:Diagnosis, Differential; D004403:Dysentery / Q000175:diagnosis; D006801:Humans