1. Department of Internal Medicine Pingtung Hospital, Ministry of Health and Welfare Pingtung Taiwan
2. Division of Gastroenterology, Department of Internal Medicine Kaohsiung Medical University Hospital Kaohsiung Taiwan
3. Department of Internal Medicine Kaohsiung Municipal Siaogang Hospital Kaohsiung Taiwan
4. Department of Internal Medicine, Faculty of Medicine College of Medicine, Kaohsiung Medical University Kaohsiung Taiwan