. 2014 Nov 7;15(6):659–688. doi: 10.3348/kjr.2014.15.6.659
Copyright © 2014 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.
Table 2.
Definition of Levels of Study
