Is endoscopy useful for early diagnosis of ischaemic colitis after aortic surgery? Results of a prospective trial. - Fanti,L.; Masci,E.; Mariani,A.; Chiesa,R.; Jannello,A.; Melissano,G.; Castellano,R.; Guerini,S.; Tittobello,A. (Ital J Gastroenterol Hepatol, 1997)