RT Journal Article SR Electronic T1 Transcolonic endoscopic appendectomy: a novel natural orifice transluminal endoscopic surgery (NOTES) technique for the sessile serrated lesions involving the appendiceal orifice JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP gutjnl-2020-323018 DO 10.1136/gutjnl-2020-323018 A1 Tao Chen A1 Aiping Xu A1 Jingjing Lian A1 Yuan Chu A1 Haibin Zhang A1 Meidong Xu YR 2021 UL http://gut.bmj.com/content/early/2021/01/21/gutjnl-2020-323018.abstract AB