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Publisher's Note: Update to Results

Posted by PLOS_CompBiol on 10 Jan 2013 at 16:24 GMT

The methods reported in this paper vary slightly from the methods that were actually applied. After re-analysis as per the originally reported methods, the main conclusions of the paper remain unaffected. However, some details in the results differ. Please find a report on the updated results, which highlights their differences from the original analysis, here: http://www.ploscompbiol.o...

No competing interests declared.