Black esophagus: a life-threatening adverse event associated with endoscopic retrograde cholangiopancreatography - Koh Kitagawa; Hiroyuki Masuda; Akira Mitoro; Fumimasa Tomooka; Shohei Asada; Norihisa Nishimura; Kosuke Kaji; Hitoshi Yoshiji (Korean Society of Gastrointestinal Endoscopy, 2024)