. 2016 Aug 30;35(4):267–280. doi: 10.14366/usg.16035
Copyright © 2016 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 non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.