1. Department of Gastroenterology; Sir Run Run Shaw Hospital; School of Medicine; Zhejiang University; Hangzhou Zhejiang Province China
2. Department of Gastroenterology; The First People's Hospital of Hangzhou; Hangzhou Zhejiang Province China
3. Division of Gastroenterology & Hepatology; University Hospital Zürich; Zürich Switzerland
4. Abdominal Center: Gastroenterology; St. Claraspital; Basel Switzerland