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Publisher's Note: Error in contributions

Posted by PLOS_ONE_Group on 18 Jun 2013 at 22:34 GMT

There was an error in Author Contributions. Angelo Valleriani (AV) was incorrectly listed as having "Conceived and designed the experiments." The correct contributions are: Conceived the project: AV. Analytical computations: AV CD RL. Data collection and statistics: CD AV RL. Analyzed the data: CD AV RL. Wrote the paper: CD AV RL.

No competing interests declared.