. 2015 Mar 10;34(4):312–323. doi: 10.14366/usg.15005
Copyright © 2015 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/3.0/) which permits unrestricted noncommercial use, distribution, and reproduction in any medium, provided the original work is properly cited.