Zeleňáková, Adriana
Hrubovčák, Pavol
Kapusta, Ondrej
Kučerka, Norbert
Kuklin, Aleksander
Ivankov, Oleksandr
Zeleňák, Vladimír
Article History
Received: 23 July 2019
Accepted: 17 October 2019
First Online: 1 November 2019
Competing interests
: The authors declare no competing interests.