1. Department of Radiation Oncology
2. Institute of Public Health, National Yang-Ming University, Taipei, Taiwan
3. Department of Otorhinolaryngology, Head and Neck Surgery, and
4. Division of Hematology/Oncology, Department of Internal Oncology, Chang Gung Memorial Hospital, Taoyuan, Taiwan
5. School of Medical Technology, Chang Gung University, Taipei Chang Gung Head and Neck Oncology Group, Taoyuan, Taiwan