1Division of Gastroenterology, Department of Medicine, Taipei Veterans General Hospital, Taipei, Taiwan, R.O.C.
2Institutes of Clinical Medicine and National Yang-Ming University School of Medicine, Taipei, Taiwan, R.O.C.
3Faculty of Medicine, National Yang-Ming University School of Medicine, Taipei, Taiwan, R.O.C.
4Departments of Medical Research and Education, Taipei Veterans General Hospital; Taipei, Taiwan, R.O.C.
5Departments of Radiology, Taipei Veterans General Hospital; Taipei, Taiwan, R.O.C.
6Departments of Pathology and Laboratory Medicine, Taipei Veterans General Hospital; Taipei, Taiwan, R.O.C.
7Institutes of Pharmacology and National Yang-Ming University School of Medicine, Taipei, Taiwan, R.O.C.