Dysplasia and deoxyribonucleic acid aneuploidy in the assessment of precancerous changes in chronic ulcerative colitis - Melville,D.M.; Jass,J.R.; Dhepherd,N.A.; Northover,J.M.A.; Capellaro,D.; Richman,P.I.; Lennard-Jones,J.E.; Ritchie,J.K.; Andersen,S.N. (Gastroenterology, 1988)