Health-code-based triage versus universal COVID-19 PCR testing before endoscopy in a low incidence area: a real-world experience. Issue 2 (9th November 2022) - Duan, Zhihui; Liu, Dengxiang; Zhou, Shengyun; Li, Hui; Sun, Xiaofang; Zhao, Chunqian; Duan, Qiong; Li, Liwei; Zhang, Xiaochong; Jin, Lingxuan