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Additional Information

Competing Interests

The authors declare that there is no conflict of interests.

Author Contributions

Shou-Qing Ni 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.

Ning Yang performed the experiments, wrote the paper, prepared figures and/or tables.

Grant Disclosures

The following grant information was disclosed by the authors:

This work was supported by the National Natural Science Foundation of China (Nos. 51108251 & 21177075), Research Award Fund for Outstanding Middle-aged and Young Scientist of Shandong Province (No. BS2012HZ007), Independent Innovation Foundation of Shandong University (No. 2012GN001) and the Overseas Personnel Pioneer Plan of Jinan (No. 20110406).

Funding

This work was supported by the National Natural Science Foundation of China (Nos. 51108251 & 21177075), Research Award Fund for Outstanding Middle-aged and Young Scientist of Shandong Province (No. BS2012HZ007), Independent Innovation Foundation of Shandong University (No. 2012GN001) and the Overseas Personnel Pioneer Plan of Jinan (No. 20110406). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.


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