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. 2016 Oct 7;6:34928. doi: 10.1038/srep34928

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Copyright © 2016, The Author(s)

This work is licensed under a Creative Commons Attribution 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 to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

PMC Copyright notice

The figure was created by Haidong Zhou using Visio 2007 (Version: Microsoft Office Visio 2007 (12.0.4518.1014) MSo (12.0.4518.1014), https://products.office.com), and the base maps in this figure were generated by Haidong Zhou and Xuelian Wang using the software MapGIS (Version: MapGIS 6.7 build 041010, http://www.mapgis.com.cn (http://english.mapgis.com.cn/en/ for English)).