New colorectal endoscopic submucosal dissection technique using a single tunnel: the “gateway” method - Ohno, Akiko; Kato, Atsushi; Kusuhara, Mitsunori; Miyamoto, Naohiko; Arai, Kensuke; Tsuji, Yosuke; Hisamatsu, Tadakazu (Endoscopy, 2019)