1. Division of Gastroenterology; Taipei Veterans General Hospital; Taipei Taiwan
2. Department of Medicine; National Yang-Ming University School of Medicine; Taipei Taiwan
3. Institute of Clinical Medicine; National Yang-Ming University School of Medicine; Taipei Taiwan
4. Division of General Medicine; Department of Medicine; Taipei Veterans General Hospital; Taipei Taiwan
5. Institute of Pharmacology; National Yang-Ming University School of Medicine; Taipei Taiwan