- Correspondence to Dr Eui-Cheol Nam, Department of Otolaryngology, School of Medicine, Kangwon National University, 1 Kangwondaehak-gil, Chuncheon, Kangwon-do 200-701, Republic of Korea;
- Received January 13, 2012
- Accepted April 12, 2012
- First published May 23, 2012.
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