Pay attention to a “window-blind” appearance of the distal rectal muscle layer during endoscopic submucosal dissection - Hayashi, Yoshikazu; Okada, Masahiro; Fukuda, Hisashi; Miura, Yoshimasa; Sunada, Keijiro; Lefor, Alan K.; Yamamoto, Hironori (Endoscopy, 2018)