Affiliation: | 1.Department of Otorhinolaryngology-Head and Neck Surgery, Chung-Ang University College of Medicine, Seoul, Korea; 2.Department of Otorhinolaryngology, Gyeongsang National University Changwon Hospital, Gyeongsang National University College of Medicine, Changwon, Korea; 3.Department of Biochemistry, Chonnam National University Medical School, Hwasun, Korea; 4.Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University College of Medicine, Seoul, Korea |