1. Department of Otolaryngology, Chonnam National University Medical School, Gwangju, Korea.
2. Research Institute of Medical Sciences, Chonnam National University, Gwangju, Korea.
3. Department of Physiology, Chonnam National University Medical School, Gwangju, Korea.
4. Brain Korea 21 Project, Center for Biomedical Human Resources at Chonnam National University, Gwangju, Korea.