1. Department of Otolaryngology, Head and Neck Surgery, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan
2. Department of Otolaryngology, Chung Shan Medical University Hospital and School of Medicine, Taichung, Taiwan
3. Department of Otolaryngology, Head and Neck surgery, National Defense Medical Center, Taipei, Taiwan
4. Department of Otolaryngology, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung, Taiwan