Funding for this research was provided by:
Agentúra Ministerstva Školstva, Vedy, Výskumu a Športu SR (16-0531)
Vedecka grantova agentura ministerstva skolstva (2/0088/18)
Text and Data Mining valid from 2019-05-10
Received: 17 January 2019
Accepted: 2 May 2019
First Online: 10 May 2019
: The authors declare that they have no competing interests.