1. Division of Gastroenterology and Hepatology, Min-Sheng General Hospital, Taoyuan 33044, Taiwan
2. School of Medicine, National Yang Ming Chiao Tung University, Taipei 11221, Taiwan
3. Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
4. VA Sierra Nevada Health Care System, Reno, NV 89502, USA
5. Department of Medicine, Taipei Veterans General Hospital, Taipei 11217, Taiwan
6. Healthcare & Services Center, Taipei Veterans General Hospital, Taipei 11217, Taiwan
7. Institute of Clinical Medicine, National Yang Ming Chiao Tung University, Taipei 11221, Taiwan
8. Department of Medical Research, Taipei Veterans General Hospital, Taipei 11217, Taiwan
9. Institute of Pharmacology, National Yang Ming Chiao Tung University, Taipei 11221, Taiwan