1. Dr S.J. Kim is a Clinical Professor, Department of Otorhinolaryngology, Eulji University Hospital, Eulji University School of Medicine, Daejeon, Republic of Korea. Dr Ryu is a Resident, and Drs S.W. Kim and Lee are Professors, Department of Otorhinolaryngology-Head and Neck Surgery, Graduate School, Kyung Hee University, Seoul, Republic of Korea.