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Publisher's Note: Error in Author Contributions.

Posted by PLOS_ONE_Group on 08 Jun 2012 at 22:48 GMT

Though
http://plosone.org/article/info:doi/10.1371/journal.pone.0027253#article1.body1.sec1.p1

The Author Contributions were incomplete. XZ ZSY IIG wrote the paper.

No competing interests declared.