. 2009 Sep 8;23(3):188–192. doi: 10.3341/kjo.2009.23.3.188
Copyright © 2009 by the Korean Ophthalmological Society
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.