title: Frequency and significance of proximal extension of distal ulcerative colitis.
authors.affiliation: St Mark's Hospital, Harrow, UK.
authors.forename: A
authors.initials: A
authors.lastname: Forbes
mesh_terms: D002986:Clinical Trials as Topic; D003093:Colitis, Ulcerative / Q000175:diagnosis / Q000453:epidemiology* / Q000503:physiopathology*; D018450:Disease Progression; D006801:Humans; D015994:Incidence; D011349:Proctitis / Q000175:diagnosis / Q000503:physiopathology*; D011379:Prognosis; D012307:Risk Factors