Funding for this research was provided by:
Grantová Agentura České Republiky (17-00551S)
Text and Data Mining valid from 2018-05-30
Received: 20 February 2018
Accepted: 18 May 2018
First Online: 30 May 2018
Ethics approval and consent to participate
: Not applicable.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.