1. Department of Radiation Oncology, Chang Gung Memorial Hospital at Linkou, Taoyuan, Taiwan
2. College of Medicine, Chang Gung University, Taoyuan, Taiwan
3. Division of Medical Oncology, Department of Internal Medicine, Chang Gung Memorial Hospital at Linkou, Taoyuan, Taiwan
4. Section of Head and Neck Surgery, Department of Otorhinolaryngology, Chang Gung Memorial Hospital at Linkou, Taoyuan, Taiwan