Funding for this research was provided by:
Eesti Teadusagentuur (PUT1050, IUT19-9)
Text and Data Mining valid from 2019-06-11
Received: 5 April 2019
Accepted: 24 May 2019
First Online: 11 June 2019
Change Date: 20 November 2019
Change Type: Correction
Change Details: An amendment to this paper has been published and can be accessed via a link at the top of the paper.
: The authors declare no competing interests.