1. Division of Colon and Rectal Surgery, Department of Surgery, Taipei Veterans General Hospital and Department of Surgery, National Yang-Ming University, Taipei, Taiwan.
2. Department of Internal Medicine, National Taiwan University Hospital, Taipei, Taiwan.
3. Division of Colon and Rectal Surgery, Department of Surgery, National Taiwan University Hospital, Taipei, Taiwan.
4. Division of Colorectal Surgery, Chang Gung Memorial Hospital at Linkou, Taoyuan, Taiwan.
5. Division of Colon and Rectal Surgery, Department of Surgery, Mackay Memorial Hospital, Taipei, Taiwan.
6. Department of Internal Medicine, Mackay Memorial Hospital, Taipei, Taiwan.
7. Division of Gastroenterology, Department of Internal Medicine, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan.
8. Division of Colorectal Surgery, Department of Surgery, Taichung Veterans General Hospital, Taichung, Taiwan.