1. Department of Otolaryngology, Gyeongsang National University, Jinju, Korea.
2. Institute of Health Sciences, Gyeongsang National University, Jinju, Korea.
3. Department of Otorhinolaryngology-Head & Neck Surgery, College of Medicine, Dankook University, Cheonan, Korea.
4. Department of Otorhinolaryngology, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Korea.
5. Department of Otorhinolaryngology-Head and Neck Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.