Funding for this research was provided by:
Ministerstwo Nauki i Szkolnictwa Wyższego (0050/RS4/2016/54)
University of Silesia in Katowice
Article History
Received: 9 January 2020
Accepted: 4 August 2020
First Online: 18 August 2020
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.