Hyun Jin Min1, Kyung Soo Kim2. 1. Department of Otorhinolaryngology-Head and Neck Surgery, Chung-Ang University College of Medicine, 224-1, Heukseok-dong, Dongjak-gu, Seoul, 156-755, Korea. 2. Department of Otorhinolaryngology-Head and Neck Surgery, Chung-Ang University College of Medicine, 224-1, Heukseok-dong, Dongjak-gu, Seoul, 156-755, Korea. 99-21045@hanmail.net.