1 Division of Gastroenterology and Hepatology, Taipei Veterans General Hospital, Taipei, Taiwan, ROC; Department of Medicine, National Yang-Ming University School of Medicine, Taipei, Taiwan, ROC.
2 Division of Gastroenterology and Hepatology, Taipei Veterans General Hospital, Taipei, Taiwan, ROC; Division of General Medicine, Department of Medicine, Taipei Veterans General Hospital, Taipei, Taiwan, ROC; Institute of Clinical Medicine, National Yang-Ming University School of Medicine, Taipei, Taiwan, ROC; Department of Medicine, National Yang-Ming University School of Medicine, Taipei, Taiwan, ROC. Electronic address: crystalyyyang@gmail.com.