Funding for this research was provided by:
Scientific Grant Agency VEGA of the Ministry of the Education, Science, Research and Sport of Slovak Republic (1/0295/15)
Slovak Research and Development Agency (APVV) of the Ministry of Education, Science, Research and Sport of Slovak Republic (0656-12)
Article History
Received: 21 May 2019
Accepted: 31 July 2019
First Online: 11 August 2019
Compliance with Ethical Standards
:
: The authors declare that they have no conflict of interest.