1. Department of Otorhinolaryngology; Gyeongsang National University Hospital; Jinju Korea
2. Department of Otorhinolaryngology-Head and Neck Surgery; Division of Hematology-Oncology; Samsung Medical Center; Sungkyunkwan University School of Medicine; Seoul Korea
3. Department of Medicine; Samsung Medical Center; Sungkyunkwan University School of Medicine; Seoul Korea
4. Department of Radiation Oncology; Samsung Medical Center; Sungkyunkwan University School of Medicine; Seoul Korea
5. Department of Pathology; Samsung Medical Center; Sungkyunkwan University School of Medicine; Seoul Korea