Text and Data Mining valid from 2019-05-29
Received: 26 November 2018
Revised: 4 March 2019
Accepted: 11 April 2019
First Online: 29 May 2019
Change Date: 28 June 2019
Change Type: Correction
Change Details: A correction 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.