. 2017 Jul 31;60(4):404–416. doi: 10.3340/jkns.2016.1010.008
Copyright © 2017 The Korean Neurosurgical 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.