1 Department of Neurology, Chonnam National University Hospital, Chonnam National University Medical School, Gwangju, Korea.
2 Department of Otolaryngology-Head and Neck Surgery, Chonnam National University Hospital, Chonnam National University Medical School, Gwangju, Korea.
3 Department of Neurology, Chonnam National University Hospital, Chonnam National University Medical School, Gwangju, Korea. nrshlee@chonnam.ac.kr.