Endoscopic full-thickness resection with double-layer closure by endoscopic hand suturing for a gastric subepithelial tumor - Goto, Osamu; Koizumi, Eriko; Higuchi, Kazutoshi; Onda, Takeshi; Omori, Jun; Akimoto, Naohiko; Iwakiri, Katsuhiko (Endoscopy, 2022)