RT Journal Article SR Electronic T1 Carcinoma of the duodenum. JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 222 OP 226 DO 10.1136/gut.9.2.222 VO 9 IS 2 A1 L Kreel A1 C Mackintosh YR 1968 UL http://gut.bmj.com/content/9/2/222.abstract AB