Updates are available Erratum dated 2016-04-05

Article History

Received: 11 February 2015

Accepted: 26 September 2015

First Online: 9 November 2015

Change Date: 4 February 2016

Change Type: Correction

Change Details: In the version of this Article originally published, the data in Figs 1b–e and 2 were incorrect because of a coding error in the Monte Carlo analysis; the figures have now been replaced. Supplementary Figs 1–3 and Tables 1–7 also relied on these calculations and have been replaced. Furthermore, in the caption to Fig. 1e inset and in the related sentence in the main text, the values discussed were incorrect and have now been amended. None of these changes affect our conclusions. These errors have been corrected in the online versions of the Article.

Competing interests

: The authors declare no competing financial interests.