1. Department of Otolaryngology-Head and Neck Surgery, Chonnam National University Medical School, Gwangju, Korea.
2. Department of Physiology, Chonnam National University Medical School, Gwangju, Korea.
3. Department of Rehabilitation Medicine, Chonnam National University Medical School, Gwangju, Korea.
4. Department of Pathology, Chonnam National University Medical School, Gwangju, Korea.