Nowakowska, Karolina
Pacholczak, Andrzej
Tepper, Waldemar
Article History
Received: 28 August 2018
Accepted: 21 January 2019
First Online: 7 February 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest. The research was financed only from the internal resources of the Department intended for research as part of the doctoral thesis.