RT Journal Article SR Electronic T1 Letter to editor: piecemeal cold snare polypectomy versus conventional endoscopic mucosal resection for large sessile serrated lesions JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP gutjnl-2021-324531 DO 10.1136/gutjnl-2021-324531 A1 Haiying Guan A1 Chunyan Zeng A1 Youxiang Chen YR 2021 UL http://gut.bmj.com/content/early/2021/04/06/gutjnl-2021-324531.abstract AB