1. Department of Otolaryngology-Head and Neck Surgery, Chonnam National University Medical School, Gwangju, Korea.
2. ENTOP ENT Clinics, Gwangju, Korea.
3. Department of Otolaryngology-Head and Neck Surgery, Kwangju Christian Hospital, Gwangju, Korea.
4. Department of Physiology, Chonnam National University Medical School, Gwangju, Korea.