1. Division of Colorectal Surgery, Department of Surgery Kaohsiung Medical University Hospital Kaohsiung Taiwan
2. Department of Surgery, Faculty of Medicine College of Medicine, Kaohsiung Medical University Kaohsiung Taiwan
3. Department of Pathology Kaohsiung Medical University Hospital Kaohsiung Taiwan
4. Graduate Institute of Clinical Medicine, College of Medicine, Kaohsiung Medical University Kaohsiung Taiwan
5. Graduate Institute of Medicine, College of Medicine, Kaohsiung Medical University Kaohsiung Taiwan
6. Pingtung Hospital, Ministry of Health and Welfare Pingtung Taiwan