Usefulness of intraductal cholangioscopy biopsy forceps in critical strictures of the biliary anastomosis after liver transplantation - Martínez-Moreno, Belén; Martínez-Sempere, Juan; Ruíz Gómez, Francisco; Compañy, Luis; Mangas-Sanjuan, Carolina; Casellas, Juan Antonio; Aparicio, José Ramón (Endoscopy, 2022)