RT Journal Article SR Electronic T1 Epidemiology of Cancer of the Digestive Tract JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 774 OP 774 DO 10.1136/gut.24.8.774 VO 24 IS 8 A1 Logan, Richard F A YR 1983 UL http://gut.bmj.com/content/24/8/774.1.abstract AB