. 2011 Feb 23;5(1):49–52. doi: 10.3342/ceo.2012.5.1.49
Copyright © 2012 by 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.