RT Journal Article SR Electronic T1 Peptic Ulcer JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 428 OP 429 DO 10.1136/gut.23.5.428-b VO 23 IS 5 A1 Wormsley, K G YR 1982 UL http://gut.bmj.com/content/23/5/428.3.abstract AB