1. Henan Key Laboratory for Helicobacter pylori and Microbiota and GI Cancer, Marshall Medical Research Center, Fifth Affiliated Hospital of Zhengzhou University, Zhengzhou 450000, China
2. Academy of Medical Science, Zhengzhou University, Zhengzhou 450000, China
3. Department of Gastroenterology, Fifth Affiliated Hospital of Zhengzhou University, Zhengzhou 450000, China