1. Division of General and Digestive Surgery, Department of Surgery; Kaohsiung Medical University Hospital, Kaohsiung 807, Taiwan, R.O.C.
2. Department of Surgery, Faculty of Medicine, Kaohsiung Medical University, Kaohsiung 807, Taiwan, R.O.C.
3. Department of Pathology; Kaohsiung Medical University Hospital, Kaohsiung 807, Taiwan, R.O.C.
4. Division of Colorectal Surgery, Department of Surgery, Kaohsiung Medical University, Kaohsiung 807, Taiwan, R.O.C.
5. Division of Gastroenterology, Department of Internal Medicine, Kaohsiung Medical University Hospital and Kaohsiung Medical University, Kaohsiung 807, Taiwan, R.O.C.