1. Department of Otolaryngology-HNS, Chonbuk National University, JeonJu, Korea;
2. Research Institute for Clinical Medicine of Chonbuk National University – Biomedical Research Institute of Chonbuk National University Hospital, Chonbuk National University, JeonJu, Korea;
3. Department of Speech-Language Therapy, Chonbuk National University, JeonJu, Korea