Text and Data Mining valid from 2017-03-22
Received: 14 December 2016
Accepted: 20 February 2017
First Online: 22 March 2017
Change Date: 22 December 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 been fixed in the paper.
: The authors declare no competing financial interests.