1. Institute of Clinical Medicine, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan, Taiwan
2. Department of Internal Medicine, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan, Taiwan
3. Department of Internal Medicine, Taichung Veterans General Hospital, Taichung, Taiwan
4. Department of Internal Medicine, National Taiwan University Hospital, Taipei, Taiwan
5. Gastroenterology Endoscopy Center, Chang Gung Memorial Hospital, Linko, Taiwan
6. Department of Internal Medicine, Chung Shan Medical University Hospital, Taichung, Taiwan
7. Department of Internal Medicine, Tainan Hospital, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan
8. School of Medicine, Fu Jen Catholic University, No. 510 Zhongzheng Road, Xinzhuang District, New Taipei City 24205, Taiwan