Sanecka, Elżbieta http://orcid.org/0000-0003-3401-2782
Funding for this research was provided by:
University of Silesia in Katowice
Article History
First Online: 17 January 2020
Compliance with Ethical Standards
:
: The author declares no conflicts 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 and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: Informed consent was obtained from all individual participants included in the study.