1. Division of Gastroenterology, Department of Internal Medicine, China Medical University Hospital, Taichung 40447, Taiwan
2. Endoscopy Center, Department of Gastroenterology, Changhua Christian Hospital, Changhua 50000, Taiwan
3. Department of Gastroenterology and Hepatology, Linkou Chang Gung Memorial Hospital, Chang Gung University College of Medicine, Taoyuan 33344, Taiwan
4. Division of Hepato-Gastroenterology, Department of Internal Medicine, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung 83301, Taiwan
5. Department of Gastroenterology, Buddhist Taichung Tzu Chi Hospital, Taichung 42700, Taiwan
6. Division of Gastroenterology, Department of Internal Medicine, Mackay Memorial Hospital, Taipei 10449, Taiwan
7. Department of Internal Medicine, National Taiwan University Hospital, Taipei 10002, Taiwan
8. Department of Internal Medicine, Kaohsiung Medical University Hospital, Kaohsiung 80700, Taiwan
9. Division of Gastroenterology, Tri-Service General Hospital, Taipei 11400, Taiwan