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Publisher's Note: Error in author byline.

Posted by PLOS_ONE_Group on 25 Sep 2012 at 22:19 GMT

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http://plosone.org/article/info:doi/10.1371/journal.pone.0045820#article1.front1.article-meta1.abstract1.sec1.p1

In the author byline, author Jun Zhang should not have been noted as having equal contributions to the article. He is instead a co-corresponding author who can be contacted at: jameszhang2000@163.com.

No competing interests declared.