1. Department of Gastroenterology, The Second Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou 310003, Zhejiang Province, China
2. Department of Gastroenterology, Lishui Hospital of Zhejiang University, Lishui Municipal Central Hospital, The Fifth Affiliated Hospital of Wenzhou Medical University, Lishui 32300, Zhejiang Province, China
3. Department of Gastroenterology, the First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou 310003, Zhejiang Province, China
4. Division of Dig Ive Diseases, Department of Medicine, University of Mississippi Medical Center, Jackson, MS, USA