RT Journal Article SR Electronic T1 Dietary factors associated with duodenal ulcer. JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 456 OP 456 DO 10.1136/gut.32.4.456 VO 32 IS 4 A1 I Segal A1 A R Walker A1 H H Vorster YR 1991 UL http://gut.bmj.com/content/32/4/456.1.abstract AB