1. Department of Surgery, Kaohsiung Municipal Ta-Tung Hospital, Kaohsiung, Taiwan
2. Division of General and Digestive Surgery, Department of Surgery, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan
3. Department of Surgery, Health and Welfare Ministry Pingtung Hospital, Pingtung, Taiwan
4. Graduate Institute of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan