Ścigała, Roman http://orcid.org/0000-0002-6927-091X
Szafulera, Katarzyna http://orcid.org/0000-0001-7303-279X
Article History
Received: 26 July 2019
Accepted: 26 November 2019
First Online: 9 December 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.