. 2015 Feb 16;47(4):781–789. doi: 10.4143/crt.2014.261
Copyright © 2015 by the Korean Cancer Association
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.
Fig. 1.
Study flow diagram.