Szefczyk-Polowczyk, Lucyna
Mandera, Marek http://orcid.org/0000-0003-2141-7932
Article History
Received: 3 November 2019
Accepted: 11 January 2020
First Online: 23 January 2020
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee (Ethics Committee of the Medical University of Silesia, decision KNW/0022/KB/129/13) and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.