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. 2016 Oct 13;6:35311. doi: 10.1038/srep35311

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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 map was created using ArcGIS 10.0 (http://www.esrichina-bj.cn/softwareproduct/ArcGIS/). The rhombus refers to sampling site, the square refers to sewage water treatment plant, and the circle refers to town.