1. Department of Otorhinolaryngology-Head and Neck Surgery; Seoul National University Bundang Hospital; Seongnam Korea
2. Department of Otorhinolaryngology; Korea Cancer Center Hospital; Seoul Korea
3. Department of Otolaryngology, Head and Neck Surgery; Dongnam Institute of Radiological and Medical Sciences Cancer Center; Busan Korea
4. Department of Otorhinolaryngology-Head and Neck Surgery; Seoul National University Hospital; Seoul Korea
5. Department of Thoracic and Cardiovascular Surgery; Samsung Medical Center; Seoul Korea
6. Department of Dermatology, Dongtan Sacred Heart Hospital; Hallym University College of Medicine; Hwaseong Korea