1. Department of Gastroenterology; Sir Run Run Shaw Hospital; School of Medicine; Zhejiang University; Hangzhou China
2. Division of Gastroenterology & Hepatology; Tongde Hospital of Zhejiang Province; Hangzhou China
3. Division of surgery; Affiliated Hospital of Hebei University of Engineering; Handan Hebei China
4. Division of Gastroenterology & Hepatology; University Hospital Zürich; Zürich Switzerland
5. Zürich Centre for Integrative Human Physiology (ZIHP); University of Zürich; Zürich Switzerland
6. Nottingham Digestive Diseases Center and Biomedical Research Unit; Queen's Medical Center; Nottingham UK