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. 2016 Oct 27;6:36081. doi: 10.1038/srep36081

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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/

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On the left is the map of China, in Which Qingdao City was marked as dark. On the right is the map of Qingdao City with Huangdao district. The maps were constructed using ArcGIS10.1 software (http://resources.arcgis.com/en/home/).