. 2009 May 20;19(4):541–546. doi: 10.3346/jkms.2004.19.4.541
Copyright © 2004 The Korean Academy of Medical Sciences
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.