1. Department of Otolaryngology; Chang Gung Memorial Hospital at Linkou and Chang Gung University; Taiwan Republic of China
2. Department of Otolaryngology, Head and Neck Surgery; Changi General Hospital; Singapore
3. Department of Epidemiology; Chang Gung University; Tao-Yuan Taiwan Republic of China
4. Department of Radiation Oncology; Chang Gung Memorial Hospital at Linkou, Chang Gung University; Taiwan Republic of China
5. Department of Plastic and Reconstructive Surgery; Chang Gung Memorial Hospital at Linkou, Chang Gung University; Taiwan Republic of China
6. Department of Medical Oncology; Chang Gung Memorial Hospital at Linkou, Chang Gung University; Taiwan Republic of China