- Correspondence to Professor Ja-Won Koo, Department of Otorhinolaryngology—Head & Neck Surgery, Seoul National University Bundang Hospital, 300 Gumi-dong, Bundang-gu, Seongnam, Gyeonggi-do 463-707, Republic of Korea;
- Received June 9, 2008
- Revised August 8, 2008
- Accepted August 18, 2008
- First published February 22, 2010.
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