. 2014 Aug 22;4:6113. doi: 10.1038/srep06113
Copyright © 2014, Macmillan Publishers Limited. All rights reserved
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International License. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder in order to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-nd/4.0/
Figure 1. Flow chart of literature screening.
