1. Department of Otorhinolaryngology, College of Medicine, Pusan National University, Busan, Republic of Korea
2. Department of Otorhinolaryngology and Biomedical Research Institute, Pusan National University Hospital, Busan, Republic of Korea
3. Department of Otorhinolaryngology and Biomedical Research Institute, Yangsan Pusan National University Hospital, Yangsan, Republic of Korea