Text and Data Mining valid from 2015-05-04
Received: 17 November 2014
Accepted: 31 March 2015
First Online: 4 May 2015
Change Date: 14 May 2015
Change Type: Correction
Change Details: In the version of this supplementary file originally posted online on 4 May 2015, the title and legend of <b>Supplementary Figure 7</b> reproduced part of the title and legend from Supplementary Figure 6, and descriptions of panels <b>c–f</b> were missing. The errors have been corrected in this file as of 14 May 2015.
: The authors declare no competing financial interests.