1. The Third School of Clinical Medicine, Ningxia Medical University, Yinchuan, China
2. Department of Gastroenterology, Endoscopic center, People’s Hospital of Ningxia Hui Autonomous Region, Yinchuan, China
3. Tongji Hospital, School of Medicine, Tongji University, Shanghai, China
4. Institute of Digestive Disease, School of Medicine, Tongji University, Shanghai, China
5. Department of Gastroenterology, The Second Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou, China
6. China Center for Helicobacter Pylori Molecular Medicine, Shanghai, China
7. Department of Hepatobiliary Surgery, People’s Hospital of Ningxia Hui Autonomous Region, Yinchuan, China
8. Department of Gastroenterology, The Second Affiliated Hospital of Hai Nan Medical College, Haikou, China
9. The Gastroenterology Clinical Medical Center of Hainan Province, Haikou, China