1. Department of Otorhinolaryngology; Gyeongsang National University Changwon Hospital, Gyeongsang National University School of Medicine; Changwon Republic of Korea
2. Department of Preventive Medicine; Gyeongsang National University Hospital, Gyeongsang National University School of Medicine; Jinjoo Republic of Korea
3. Department of Otolaryngology; Asan Medical Center, University of Ulsan College of Medicine; Seoul Republic of Korea
4. Department of Radiation Oncology; Asan Medical Center, University of Ulsan College of Medicine; Seoul Republic of Korea
5. Department of Internal Medicine (Oncology); Asan Medical Center, University of Ulsan College of Medicine; Seoul Republic of Korea