A novel clip closure method using precutting and a reopenable clip after colorectal endoscopic submucosal dissection - Ohmori, Masayasu; Yamasaki, Yasushi; Yamamoto, Shumpei; Kinugasa, Hideaki; Harada, Keita; Hiraoka, Sakiko; Okada, Hiroyuki (Endoscopy, 2021)