Article History
Accepted: 29 July 2021
First Online: 21 August 2021
Declarations
:
: The authors declare that they have no conflict of interest.
: All procedures performed in the current study involving human subjects 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. The University Research Ethics Committee at The University of Opole approved the study—the reference number for the approval: UREC ‒ UO/04/2020.