1. Department of Otorhinolaryngology, Gyeongsang National University School of Medicine, Jinju, Korea.
2. Institute of Health Sciences, Gyeongsang National University School of Medicine, Jinju, Korea.
3. Dong-A University Hospital Regional Cardiocerebrovascular Center, Busan, Korea.
4. Biomedical Research Institute, Gyeongsang National University Hospital, Jinju, Korea.