1. Graduate Institute of Clinical Medicine, College of Medicine Kaohsiung Medical University Kaohsiung Taiwan
2. Department of Medicine, College of Medicine Kaohsiung Medical University Kaohsiung City Taiwan
3. Division of Gastroenterology, Department of Internal Medicine Kaohsiung Medical University Hospital Kaohsiung Taiwan
4. Division of Gastroenterology, Department of Internal Medicine An Nan Hospital, China Medical University Tainan Taiwan
5. Department of Microbiology and Immunology, School of Medicine, College of Medicine Kaohsiung Medical University Kaohsiung Taiwan
6. Internal Medicine University of Michigan Health System Ann Arbor Michigan USA
7. Division of Gastroenterology, Department of Internal Medicine Kaohsiung Veterans General Hospital Kaohsiung Taiwan