1. Department of Otolaryngology-Head and Neck Surgery,Chonnam National University Medical School & Hwasun Hospital, Hwasun, South Korea
2. Department of Pathology, Chonnam National University Medical School & Hwasun Hospital, Hwasun, South Korea
3. Department of Internal Medicine, Chonnam National University Medical School & Hwasun Hospital, Hwasun, South Korea