. 2013 Oct 31;56(10):439–445. doi: 10.3345/kjp.2013.56.10.439
Copyright © 2013 by The Korean Pediatric Society
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.
Flow chart showing the study population.