RT Journal Article SR Electronic T1 ERCP training JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 597 OP 597 DO 10.1136/gut.49.4.597 VO 49 IS 4 A1 BULLIMORE, D YR 2001 UL http://gut.bmj.com/content/49/4/597.1.abstract AB