Text and Data Mining valid from 2018-08-22
Received: 1 March 2018
Accepted: 3 August 2018
First Online: 22 August 2018
Change Date: 12 November 2018
Change Type: Correction
Change Details: A correction to this article has been published and is linked from the HTML and PDF versions of this paper. The error has been fixed in the paper.
: The authors declare no competing interests.