Ho Young Lee1, Eun Kyung Kim2, Hyun Seung Choi3, Junhui Jeong3. 1. Department of Otorhinolaryngology, 37991Yonsei University College of Medicine, Seoul, Korea. 2. Department of Pathology, 65413National Health Insurance Service Ilsan Hospital, Goyang, Korea. 3. Department of Otorhinolaryngology, 65413National Health Insurance Service Ilsan Hospital, Goyang, Korea.