1 Division of Gastroenterology, Department of Internal Medicine, Kaohsiung Medical University Hospital, Kaohsiung 807, Taiwan ; Department of Medicine, Faculty of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung 807, Taiwan.
2 Division of Infectious Diseases, Department of Internal Medicine, Kaohsiung Medical University Hospital, Kaohsiung 807, Taiwan.
3 Department of Medicine, University of Malaysia, 50603 Kuala Lumpur, Malaysia.
4 Department of Microbiology, Kaohsiung Medical University, Kaohsiung 807, Taiwan.