1. Department of Surgery, Faculty of Medicine, College of Medicine, Kaohsiung Medical University Hospital, Kaohsiung 807, Taiwan
2. Department of Nursing, Min-Hwei Junior College of Health Care Management, Tainan 736, Taiwan
3. Department of Medical Research, Kaohsiung Medical University Hospital, Kaohsiung 807, Taiwan
4. Cancer Center, Kaohsiung Medical University Hospital, Kaohsiung 807, Taiwan
5. Department of Oral Maxillofacial Surgery, Kaohsiung Medical University Hospital, Kaohsiung 807, Taiwan
6. Department of Radiation Oncology, Faculty of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung 807, Taiwan
7. Department of Radiation Oncology, Kaohsiung Medical University Hospital, Kaohsiung 807, Taiwan
8. Department of Radiation Oncology, Kaohsiung Municipal Ta-Tung Hospital, Kaohsiung 801, Taiwan