title: Marked resistance during retrograde biliary stent placement: another O-ring problem.
authors.forename: F H
authors.initials: FH
authors.lastname: al-Kawas
authors.forename: A
authors.initials: A
authors.lastname: Axelrad
authors.forename: L
authors.initials: L
authors.lastname: Strack
mesh_terms: D016145:Endoscopy, Digestive System / Q000295:instrumentation*; D004868:Equipment Failure; D006801:Humans; D015607:Stents