Takáč, Tomáš
Vadovič, Pavol
Pechan, Tibor
Luptovčiak, Ivan
Šamajová, Olga
Šamaj, Jozef
Article History
Received: 5 January 2016
Accepted: 2 June 2016
First Online: 21 June 2016
Competing interests
: The authors declare no competing financial interests.