A novel, stiff-shaft, flexible-tip guidewire for cannulation of biliary stricture during endoscopic retrograde cholangiopancreatography: a randomized trial - Albert, Jörg G.; Lucas, Katja; Filmann, Natalie; Herrmann, Eva; Schröder, Oliver; Sarrazin, Christoph; Trojan, Jörg; Kronenberger, Bernd; Bojunga, Jörg; Zeuzem, Stefan; Friedrich-Rust, Mireen (Endoscopy, 2014)