1. Department of Otolaryngology-Head and Neck Surgery, Chonnam National University Hwasun Hospital, Chonnam National University Medical School, Hwasun, Korea.
2. Research Institute of Medical Sciences, Chonnam National University Hwasun Hospital, Chonnam National University Medical School, Hwasun, Korea.
3. Department of Infectious Disease, Chonnam National University Hwasun Hospital, Chonnam National University Medical School, Hwasun, Korea.