Ethics
This was a prospective, randomized and double-blinded study performed in the endoscopic unit of People’s Hospital of Chongqing Banan District between August 13, 2021 and March 25, 2022. The protocol had been registered (UMIN000044737) in UMIN Clinical Trials Registry (UMIN-CTR). Ethical approval for the study (No. 011-2021) was obtained from the Ethics Committee of People’s Hospital of Chongqing Banan District, Chongqing, China (Chairperson: Prof. Yang Tang) and written informed consent was obtained from each participant.