Funding for this research was provided by:
National Sustainability Program I provided by the Ministry of Education Youth and Sports of the Czech Republic (Nr. LO1503)
Article History
Received: 28 June 2018
Revised: 17 September 2018
Accepted: 18 September 2018
First Online: 1 October 2018
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.