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Nature Communications 5: Article number: 3979 ; DOI: 10.1038/ncomms4979 (2014); Published June 09 2014; Updated April 09 2015.
The original version of this Article contained a typographical error in the spelling of the author Nicholas E. Ilott, which was incorrectly given as Nicholas E. IIott. This has now been corrected in both the PDF and HTML versions of the Article.
