1. Division of Gastroenterology; Department of Medicine, Far Eastern Memorial Hospital; New Taipei City Taiwan
2. Division of Gastroenterology and Hepatology, Department of Medicine; Taipei Veterans General Hospital; Taipei Taiwan
3. Faculty of Medicine, School of Medicine; National Yang-Ming University; Taipei Taiwan
4. Department and Institute of Pharmacology; National Yang-Ming University; Taipei Taiwan
5. Division of Gastroenterology; Department of Medicine, Taipei Municipal Gan-Dau Hospital; Taipei Taiwan
6. Division of Gastroenterology and Hepatology, Department of Internal Medicine; Taipei Medical University Hospital; Taipei Taiwan