1. Division of General Medicine, Department of Medicine, Taipei Veterans General Hospital, Taipei, Taiwan
2. National Yang-Ming University School of Medicine, Taipei, Taiwan
3. Division of Gastroenterology, Department of Medicine, Taipei Veterans General Hospital, Taipei, Taiwan
4. Department of Medical Affair and Planning, Taipei Veterans General Hospital, Taipei, Taiwan
5. Department of Medical Research and Education, Taipei Veterans General Hospital, Taipei, Taiwan
6. Cheng-Hsin General Hospital, Taipei, Taiwan