. 2019 Aug 27;39(2):105–113. doi: 10.14366/usg.19039
Copyright © 2020 Korean Society of Ultrasound in Medicine (KSUM)
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 noncommercial use, distribution, and reproduction in any medium, provided the original work is properly cited.