1. Department of Radiation Oncology, Cancer Center, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan.
2. Department of Radiation Oncology, Faculty of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan.
3. Division of Colorectal Surgery, Department of Surgery, Taichung Veterans General Hospital, Taichung, Taiwan.
4. School of Medical and Health Sciences, Fooyin University, Kaohsiung, Taiwan.
5. Department of Medical Research, Fooyin University Hospital, Pingtung County, Taiwan.
6. Department of Surgery, Fooyin University Hospital, Pingtung County, Taiwan.
7. Division of Gastrointestinal and General Surgery, Department of Surgery, Cancer Center, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan.
8. Department of Surgery, Faculty of Medicine, College of Medicine, Graduate Institute of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan.