Text and Data Mining valid from 2018-12-01
Received: 28 May 2018
Accepted: 5 November 2018
First Online: 10 December 2018
Change Date: 12 February 2019
Change Type: Correction
Change Details: In the original version of this Article, an additional double-headed arrow was inadvertently included within Fig. 3e. This error has been corrected in both the PDF and HTML versions of the Article.
: The authors declare no competing interests.