Biliary cannulation technique with ultraslim endoscope for a patient with Billroth II gastrectomy - Saragai, Yosuke; Uchida, Daisuke; Kato, Hironari; Tomoda, Takeshi; Matsumoto, Kazuyuki; Horiguchi, Shigeru; Okada, Hiroyuki (Endoscopy, 2019)