1. Department of Gastroenterology, Nan’an District People’s Hospital of Chongqing, Chongqing, China
2. Department of Gastroenterology, Chongqing University Central Hospital (Chongqing Emergency Medical Center), Chongqing, China
3. Outpatient Department, Chongqing University Central Hospital (Chongqing Emergency Medical Center), Chongqing, China