. 2019 Dec 16;28(1):50–60. doi: 10.4250/jcvi.2019.0083
Copyright © 2020 Korean Society of Echocardiography
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (https://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.