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Additional Information

Competing Interests

The authors declare they have no competing interests.

Author Contributions

Xinhai Li conceived and designed the experiments, performed the experiments, analyzed the data, contributed reagents/materials/analysis tools, wrote the paper, prepared figures and/or tables, reviewed drafts of the paper.

Tianqing Zhai performed the experiments, wrote the paper.

Yan Jiao analyzed the data, contributed reagents/materials/analysis tools, wrote the paper, reviewed drafts of the paper.

Guiming Wang analyzed the data, contributed reagents/materials/analysis tools, wrote the paper, reviewed drafts of the paper.

Data Deposition

The following information was supplied regarding the deposition of related data:

I will post the data and code at my personal blog at http://blog.sciencenet.cn/home.php?mod=space&uid=661364&view=lixinhai

Funding

This work was supported by the Strategic Priority Research Program of the Chinese Academy of Sciences (XDA05080701) (2011-2015), and the Public Welfare Project (201209027) of the Ministry of Environmental Protection of China (2012-2013). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.


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