Coté GA, Ansstas M, Pawa R, Edmundowicz SA, Jonnalagadda SS, Pleskow DK, Azar RR. Difficult biliary cannulation: use of physician-controlled wire-guided cannulation over a pancreatic duct stent to reduce the rate of precut sphincterotomy (with video). Gastrointest Endosc. 2010 Feb; 71(2):275-9.