. 2010 Feb 28;58(2):197–201. doi: 10.4097/kjae.2010.58.2.197
Copyright © The Korean Society of Anesthesiologists, 2010
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.