Funding for this research was provided by:
Grantová Agentura České Republiky (18-21608S)
Text and Data Mining valid from 2019-08-30
Received: 16 May 2019
Accepted: 23 August 2019
First Online: 30 August 2019
Compliance with ethical standards
: The authors declare that there is no conflict of interest regarding the publication of this paper.