Przydatek, Grzegorz http://orcid.org/0000-0001-6603-6135
Kanownik, Włodzimierz
Funding for this research was provided by:
State Higher Vocational School in Nowy Sacz
Article History
Received: 16 August 2018
Accepted: 29 January 2019
First Online: 19 February 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.