1. Department of Otorhinolaryngology—Head and Neck Surgery, Soonchunhyang University College of Medicine, Bucheon, South Korea.
2. Department of Pathology, Inje University College of Medicine, Seoul, South Korea.
3. Department of Pathology, Bundang Jesaeng General Hospital, Bundang, South Korea.
4. Department of Radiology, Soonchunhyang University College of Medicine, Bucheon, South Korea.