title: Periampullary diverticulum: an indicator of easy or difficult cannulation?
authors.forename: Mitsunobu
authors.initials: M
authors.lastname: Matsushita
authors.forename: Kazushige
authors.initials: K
authors.lastname: Uchida
authors.forename: Akiyoshi
authors.initials: A
authors.lastname: Nishio
authors.forename: Kazuichi
authors.initials: K
authors.lastname: Okazaki
mesh_terms: D014670:Ampulla of Vater; D002404:Catheterization / Q000379:methods*; D003137:Common Bile Duct Diseases / Q000628:therapy*; D004240:Diverticulum / Q000628:therapy*; D006801:Humans