1. Department of Gastroenterology, Mackay Memorial Hospital, Taipei; Mackay Junior College of Medicine, Nursing and Management, Taipei; Mackay Medical College, New Taipei, Taiwan.
2. Department of Internal Medicine, National Taiwan University Hospital and College of Medicine, Taipei, Taiwan.
3. Department of Integrated Diagnostics and Therapeutics, National Taiwan University Hospital and College of Medicine, Taipei, Taiwan.
4. Department of Medical Imaging, National Taiwan University Hospital and College of Medicine, Taipei, Taiwan.