Received: 19 March 2019
Accepted: 18 December 2019
First Online: 30 December 2019
Ethics approval and consent to participate
: The Bioethical Committee of the Faculty of Medicine of the University of Rzeszów granted permission to conduct research (No 1/6/2017). Prior to the study, all subjects were informed about its purpose and procedures and they made an informed and voluntary consent to participate in the study and signed an informed consent document.
: Not applicable.
: The authors declare that they have no competing interests<b>.</b>