1. Department of Otorhinolaryngology–Head and Neck Surgery, Gyeongsang National University, Jinju, South Korea
2. Institute of Health Sciences, Gyeongsang National University, Jinju, South Korea
3. Department of Otorhinolaryngology–Head and Neck Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea
4. Head and Neck Oncology Clinic, National Cancer Center, Ilsan, South Korea