Linked Color Imaging Demonstrates Characteristic Findings in Semi-Pedunculated Gastric Adenocarcinoma in Helicobacter pylori-Negative Normal Mucosa - Yuji Hiraoka; Yoshimasa Miura; Hiroyuki Osawa; Mio Sakaguchi; Masato Tsunoda; Alan Kawarai Lefor; Hironori Yamamoto (Korean Society of Gastrointestinal Endoscopy, 2021)