RT Journal Article SR Electronic T1 Piezoelectric shockwave fragmentation of biliary calculi. JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 1435 OP 1436 DO 10.1136/gut.30.10.1435-a VO 30 IS 10 A1 Stephenson, T J A1 Johnson, A G A1 Ross, B YR 1989 UL http://gut.bmj.com/content/30/10/1435.2.abstract AB