Endoscopic submucosal dissection of a lateral spreading tumor involving the appendiceal orifice using a multi-traction device. - Lambin, Thomas; Albouys, Jérémie; Yzet, Clara; Brun, Soline; Rostain, Florian; Rivory, Jérôme; Pioche, Mathieu (Endoscopy, 2021)