RT Journal Article SR Electronic T1 Atlas of Biliary Tract Surgery JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 159 OP 160 DO 10.1136/gut.37.1.159-b VO 37 IS 1 A1 Benjamin, I S YR 1995 UL http://gut.bmj.com/content/37/1/159.3.abstract AB