1. Department of Gastroenterology, Qilu Hospital, Shandong University, Jinan, China
2. Department of Gastroenterology, Union Hospital of Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
3. Department of Gastroenterology, First Affiliated Hospital of College of Medicine, Zhejiang University, Zhejiang, China
4. Department of Gastroenterology, Tongji Hospital of Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
5. Department of Pathology and Pathophysiology, Shandong University School of Medicine, Jinan, China