. 2016 Oct 24;59(6):537–543. doi: 10.3340/jkns.2016.59.6.537
Copyright © 2016 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.
Fig. 1. Flow diagram for identification of relevant studies.
