. 2020 Feb 5;63(6):226–231. doi: 10.3345/cep.2019.00381
Copyright © 2020 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/4.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Fig. 1.
Flow diagram of the study.