. 2009 Jun 29;2(2):90–96. doi: 10.3342/ceo.2009.2.2.90
Copyright © 2009 Korean Society of Otorhinolaryngology-Head and Neck Surgery
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.