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Publisher's Note: Error in Author Contributions

Posted by PLOS_ONE_Group on 04 Sep 2013 at 23:15 GMT

There were errors in the Author Contributions. The section should read:

Conceived and designed the experiments: YA XH NL. Performed the experiments: YA QK. Analyzed the data: YA. Wrote the paper: YA YZ XH NL.

No competing interests declared.