Department of Otorhinolaryngology, Yonsei University College of Medicine, Seoul, Korea
2.Department of Otorhinolaryngology-Head & Neck Surgery, College of Medicine andAerospace Medicine Research Group, Research Institute of Medical Science, Inha University, Incheon, Korea
3.Department of Otolaryngology-Head and Neck Surgery, Graduate School of Medicine, Gachon University of Medicine and Science, Incheon, Korea
4.Department of Otolaryngology – Head and Neck Surgery, Graduate School of Medicine, Gachon University of Medicine and Science, Incheon, South Korea
5.Department of Otolaryngology-Head & Neck Surgery, Gachon University of Medicine & Science, Graduate School of Medicine, Incheon, Korea