Text and Data Mining valid from 2015-12-01
Received: 24 June 2015
Accepted: 2 November 2015
First Online: 3 December 2015
Change Date: 7 April 2016
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.
: The authors declare no competing financial interests.