1. Department of Internal Medicine, Chiayi Branch of Taichung Veterans General Hospital, Chiayi, Taiwan.
2. Division of Gastroenterology, Department of Internal Medicine, Taichung Veterans General Hospital, Taichung, Taiwan.
3. School of Medicine, National Yang-Ming University, Taipei, Taiwan.
4. Department of Internal Medicine, Chung Shan Medical University Hospital, Taichung, Taiwan.
5. Department of Medical Laboratory and Biotechnology, Chung Shan Medical University, Taichung, Taiwan.