Text and Data Mining valid from 2020-01-06
Received: 8 August 2019
Revised: 27 November 2019
Accepted: 10 December 2019
First Online: 6 January 2020
Change Date: 9 January 2020
Change Type: Update
Change Date: 14 January 2020
Change Type: Correction
Change Details: The original version of this Article has been updated and the changes are shown in the related Correction article.
Change Details: An amendment to this paper has been published and can be accessed via a link at the top of the paper.
Compliance with ethical standards
: The authors declare that they have no conflict of interest.