1. Department of Otorhinolaryngology-Head and Neck Surgery; Seoul National University, College of Medicine; Seoul Korea
2. Department of Otorhinolaryngology-Head and Neck Surgery; Ilsong Memorial Institute of Head and Neck Cancer, Hallym University, College of Medicine; Seoul Korea
3. Department of Radiology; Hallym University, College of Medicine; Seoul Korea
4. Department of Thoracic and Cardiovascular Surgery; Hallym University, College of Medicine; Seoul Korea