1. Department of Oncology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea;
2. Department of Otolaryngology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea;
3. Department of Radiation Oncology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea;
4. Department of Nuclear Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea;
5. Department of Radiology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea;
6. Department of Pathology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea