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Publisher's Note: Error in Figures 3 and 4.

Posted by PLOS_ONE_Group on 22 Mar 2012 at 23:48 GMT

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http://plosone.org/article/info:doi/10.1371/journal.pone.0028922#pone-0028922-g004

There was an error in the placement of Figures 3 and 4. The figures were switched. The captions are correct.

No competing interests declared.