Sphincter of Oddi dysfunction (SOD): needle-knife pancreato-biliary sphincterotomy over pancreatic stent (NKOPS) has a lower post-procedure pancreatitis rate than pull-type biliary sphincterotomy (BES) [abstract]. - Sherman,S.; Eversman,D.; Fogel,E. (Gastrointest Endosc, 1997)