. 2013 Jul 17;14(4):683–691. doi: 10.3348/kjr.2013.14.4.683
Copyright © 2013 The Korean Society of Radiology
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.