Effective closure of post-gastric endoscopic submucosal dissection defect using anchor-pronged clip, string-clip, and detachable snare - Shoichi Tanaka; Nanami Yamasaki; Kentaro Hamada; Kenji Ota; Yoshiaki Matsumura; Yukiteru Yanabe; Tsuyoshi Fujimoto (Endoscopy International Open)