1. Division of Gastroenterology and Hepatology, Min-Sheng General Hospital, Taoyuan, Taiwan
2. Department of Medical Research, Taipei Veterans General Hospital, Taipei, Taiwan
3. School of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan
4. Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, Texas, USA
5. VA Sierra Nevada Health Care System, Reno, Nevada, USA
6. Division of Gastroenterology and Hepatology, Department of Medicine, Taipei Veterans General Hospital, Taipei, Taiwan
7. Institute of Clinical Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan
8. Institute of Pharmacology, National Yang Ming Chiao Tung University, Taipei, Taiwan