. 2015 Jun 5;48(3):199–201. doi: 10.5090/kjtcs.2015.48.3.199
Copyright © 2015 by The Korean Society for Thoracic and Cardiovascular Surgery. All rights Reserved.
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.