Valachovič, Milan
Štubňová, Eliška
Senko, Dušan
Kochjarová, Judita
Coldea, Gheorghe
Article History
Received: 12 November 2018
Accepted: 25 January 2019
First Online: 12 March 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.