Text and Data Mining valid from 2016-12-19
Received: 22 June 2016
Accepted: 17 November 2016
First Online: 19 December 2016
Change Date: 31 January 2017
Change Type: Erratum
Change Details: In the PDF and print versions of this article initially published, the year in the online publication date was given as 2017 instead of 2016. The error has been corrected in the PDF version of the article.
: The authors declare no competing financial interests.