1. Division of Gastroenterology and Hepatology, Department of Medicine, Taipei Veterans General Hospital, Taipei, Taiwan, ROC
2. Faculty of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan, ROC
3. Healthcare and Services Center, Taipei Veterans General Hospital, Taipei, Taiwan, ROC
4. Division of General Medicine, Department of Medicine, Taipei Veterans General Hospital, Taipei, Taiwan, ROC
5. Division of Gastroenterology, Department of Medicine, Cheng Hsin General Hospital, Taipei, Taiwan, ROC