. 2013 Dec 31;54(6):532–536. doi: 10.3340/jkns.2013.54.6.532
Copyright © 2013 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/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.