RT Journal Article SR Electronic T1 Extra hepatic portal venous obstruction. JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 1193 OP 1197 DO 10.1136/gut.28.10.1193 VO 28 IS 10 A1 Triger, D R YR 1987 UL http://gut.bmj.com/content/28/10/1193.abstract AB