1. Department of Pediatrics, Chonnam National University Hwasun Hospital, Chonnam National University Medical School, Gwangju, Korea
2. Department of Otolaryngology-Head and Neck Surgery, Chonnam National University Hwasun Hospital, Chonnam National University Medical School, Gwangju, Korea
3. Department of Pathology, Chonnam National University Hwasun Hospital, Chonnam National University Medical School, Gwangju, Korea