Successful resection of a 22-cm subcircumferential rectal lesion treated by endoscopic submucosal dissection with a mucosal-anchor-assisted multiple-tunnel method - Chiba, Hideyuki; Kuwabara, Hiroki; Yamada, Keiji; Okada, Naoya; Arimoto, Jun; Nakaoka, Michiko (Endoscopy, 2022)