1. Department of Gastroenterology, Shidong Hospital Shidong Hospital Affiliated to University of Shanghai for Science and Technology Shanghai China
2. Department of Infectious Diseases The First Affiliated Hospital of Anhui Medical University Hefei China
3. Suzhou Medical College of Soochow University Suzhou China
4. Department of Gastroenterology, Shanghai Tenth People's Hospital Tongji University School of Medicine Shanghai China