1. Department of Otorhinolaryngology - Head and Neck Surgery, Ilsan Hospital; Dongguk University; Goyang Gyeonggi Korea
2. Departments of Pathology, Ilsan Hospital; Dongguk University; Goyang Gyeonggi Korea
3. Department of Otorhinolaryngology - Head and Neck Surgery, Seoul National University Hospital; Seoul National University College of Medicine; Seoul Korea