1. Department of Otolaryngology, School of Medicine; National Yang-Ming University; Taipei Taiwan
2. School of Speech Language Pathology and Audiology; Chung Shan Medical University; Taichung Taiwan
3. Department of Otolaryngology-Head and Neck Surgery; Taichung Veterans General Hospital; Taichung Taiwan
4. School of Medicine; Chung Shan Medical University; Taichung Taiwan
5. Department of Radiation Oncology; Taichung Veterans General Hospital; Taichung Taiwan