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Publisher's Note: Omission of license details for Figure 2

Posted by PLOS_ONE_Group on 14 Nov 2013 at 20:05 GMT

The publisher erroneously failed to include license details in the legend of Figure 2. The following sentence should be added: "Printed under a CC BY license, with permission from Jenny E. Ross and Peter Leopold, original copyright 2012."

No competing interests declared.