Updates are available Erratum dated 2017-04-24

Article History

Received: 4 October 2016

Accepted: 26 January 2017

First Online: 13 March 2017

Change Date: 24 April 2017

Change Type: Update

Change Details: A correction has been published and is appended to both the HTML and PDF versions of this paper. The error has not been fixed in the paper.

Change Date: 24 April 2017

Change Type: Erratum

Change Details: Scientific Reports 7: Article number: 43647; published online 13 March 2017; updated on 24 April 2017 This Article contains an error in the legend of Figure 2 where the symbols corresponding to calculations using the spring model are incorrectly given as solid shapes. The Figure and accompanying Figure legend appear below.

Competing interests

: The authors declare no competing financial interests.