1. Department of Otolaryngology-Head and Neck Surgery, Chonnam National University Medical School and Chonnam National University Hwasun Hospital, Hwasu, Jeollanam 58128, Republic of Korea
2. Lung and Esophageal Cancer Clinic, Chonnam National University Medical School and Chonnam National University Hwasun Hospital, Hwasun, Jeollanam 58128, Republic of Korea