1. Department of Otolaryngology; Gyeongsang National University; Jinju Korea
2. Institute of Health Sciences, Gyeongsang National University; Jinju Korea
3. Department of Otorhinolaryngology-Head and Neck Surgery; Dong-A University Hospital; Busan Korea
4. Department of Otorhinolaryngology-Head and Neck Surgery; Busan National University School of Medicine; Busan Korea
5. Department of Otolaryngology; Samsung Changwon Hospital, Sungkyunkwan University School of Medicine; Changwon Korea
6. Department of Otolaryngology; Kyung Hee University School of Medicine; Seoul Korea
7. Department of Otorhinolaryngology-Head and Neck Surgery; Sungkyunkwan University School of Medicine, Samsung Medical Center; Seoul Korea