1. Department of Gastroenterology, The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui 230022, China
2. Department of Gastroenterology, The 901 Hospital of Joint Logistics Support Force, Hefei, Anhui 230031, China
3. Department of Gastroenterology, First People’s Hospital of Hefei, Hefei, Anhui 230031, China