RT Journal Article SR Electronic T1 The extent of sigmoidoscopy shown on radiographs with special reference to the rectosigmoid junction. JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 355 OP 362 DO 10.1136/gut.9.3.355 VO 9 IS 3 A1 M R Madigan A1 J M Halls YR 1968 UL http://gut.bmj.com/content/9/3/355.abstract AB