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Correction

Posted by Hashem on 13 May 2014 at 08:22 GMT

Mikhail Spivakov's affiliation is: Babraham Institute, Babraham Research Campus, Cambridge United Kingdom;

Tim Hubbard's affiliation is: Wellcome Trust Sanger Institute, Wellcome Trust Research Campus, Cambridge United Kingdom.

We apologise for this error.
On behalf of the authors.

No competing interests declared.