Rożyński, Maciej http://orcid.org/0000-0002-0387-1210
Demska-Zakęś, Krystyna
Sikora, Agnieszka
Zakęś, Zdzisław
Article History
Received: 22 November 2017
Accepted: 12 February 2018
First Online: 23 February 2018
Compliance with ethical standards
: The research presented in the submitted manuscript has been conducted in accordance with ethical standards (Agreement No. 35/2017, 30.05.2017).