RT Journal Article SR Electronic T1 Pancreatic sphincterotomy and sphincteroplasty. JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 865 OP 867 DO 10.1136/gut.33.7.865 VO 33 IS 7 A1 Watanapa, P A1 Williamson, R C YR 1992 UL http://gut.bmj.com/content/33/7/865.abstract AB