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. 2017 Jan 12;7:40607. doi: 10.1038/srep40607

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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/

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(a) Mainland China, (b) North China, (c) Northeast China, (d) Northwest China, (e) Subarea Map, (f) East China, (g) Southwest China, (h) South China, (i) Central China. The subarea map was generated in ArcGIS10.2, URL: http://www.esrichina-bj.cn/softwareproduct/ArcGIS/.