Xi-Hsuan Lin1, Jiing-Chyuan Luo2. 1. National Yang-Ming University School of Medicine, Taipei, Taiwan, ROC; Division of Gastroenterology and Hepatology, Department of Medicine, Taipei Veterans General Hospital, Taipei, Taiwan, ROC. 2. National Yang-Ming University School of Medicine, Taipei, Taiwan, ROC; Division of Gastroenterology and Hepatology, Department of Medicine, Taipei Veterans General Hospital, Taipei, Taiwan, ROC; Endoscopic Center for Diagnosis and Therapy, Taipei Veterans General Hospital, Taipei, Taiwan, ROC. Electronic address: jcluo@vghtpe.gov.tw.