Sang-Chul Lim1, Jeong-Uk Choi, Soon-Ho Bae. 1. Department of Otolaryngology-Head and Neck Surgery, Chonnam National, University Medical School and the Chonnam National University Hospital Research Institute of Clinical Medicine, Hack-dong, Dong-gu, Gwangju 501-190, Korea. limsc@chonnam.ac.kr