1. Department of Otolaryngology, Gyeongsang National University, Jinju, Korea.
2. Institute of Health Sciences, Gyeongsang National University, Jinju, Korea.
3. Dong-A University Hospital Regional Cardiocerebrovascular Center, Busan, Korea.
4. Department of Otolaryngology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
5. Department of Otolaryngology-Head and Neck Surgery, Soonchunhyang University College of Medicine, Bucheon, Korea.