Irrigation-assisted intraductal ultrasonography with a 3-Fr microcatheter during endoscopic retrograde cholangiography - Yoshida, Michihiro; Naitoh, Itaru; Hayashi, Kazuki; Natsume, Makoto; Hori, Yasuki; Kato, Akihisa; Kataoka, Hiromi (Endoscopy, 2021)