Low-pressure endoscopy using the gel immersion method facilitates endoscopic variceal ligation of ruptured esophageal varices - Sekiguchi, Hiromi; Yano, Tomonori; Tokoro, Shinnosuke; Iida, Mizuho; Tano, Shigeo; Lefor, Alan Kawarai; Yamamoto, Hironori (Endoscopy, 2021)