RT Journal Article SR Electronic T1 Health-code-based triage versus universal COVID-19 PCR testing before endoscopy in a low incidence area: a real-world experience JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP gutjnl-2022-328551 DO 10.1136/gutjnl-2022-328551 A1 Duan, Zhihui A1 Liu, Dengxiang A1 Zhou, Shengyun A1 Li, Hui A1 Sun, Xiaofang A1 Zhao, Chunqian A1 Duan, Qiong A1 Li, Liwei A1 Zhang, Xiaochong A1 Jin, Lingxuan YR 2022 UL http://gut.bmj.com/content/early/2022/11/08/gutjnl-2022-328551.abstract AB