. 2012 Sep 30;30(3):117–123. doi: 10.3857/roj.2012.30.3.117
Copyright © 2012. The Korean Society for Radiation Oncology
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.