Text and Data Mining valid from 2018-12-10
Received: 21 May 2018
Accepted: 6 November 2018
First Online: 10 December 2018
Change Date: 28 February 2019
Change Type: Correction
Change Details: In the version of this article initially published, the top right plot in Figure 4a was aligned incorrectly. The error has been corrected in the HTML and PDF versions of the article. The original and corrected figures are provided in the accompanying Publisher Correction.
: The authors declare no competing interests.