1 Department of Otorhinolaryngology and Biomedical Research Institute, Pusan National University Hospital, Busan, Republic of Korea.
2 Department of Otorhinolaryngology and Biomedical Research Institute, Yangsan Pusan National University Hospital, Yangsan, Republic of Korea.
3 Department of Otorhinolaryngology and Biomedical Research Institute, Pusan National University Hospital, Busan, Republic of Korea; Department of Otorhinolaryngology, College of Medicine, Pusan National University, Busan, Republic of Korea.
4 Department of Otorhinolaryngology and Biomedical Research Institute, Yangsan Pusan National University Hospital, Yangsan, Republic of Korea; Department of Otorhinolaryngology, College of Medicine, Pusan National University, Busan, Republic of Korea.
5 Department of Otorhinolaryngology and Biomedical Research Institute, Pusan National University Hospital, Busan, Republic of Korea; Department of Otorhinolaryngology, College of Medicine, Pusan National University, Busan, Republic of Korea. Electronic address: entmania@pusan.ac.kr.