RT Journal Article SR Electronic T1 ERCP training: for the few, not for all JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 9 OP 10 DO 10.1136/gut.45.1.9 VO 45 IS 1 A1 J BAILLIE YR 1999 UL http://gut.bmj.com/content/45/1/9.abstract AB