Funding for this research was provided by:
Śląski Uniwersytet Medyczny (KNW-1-158/N/9/K)
Received: 14 February 2020
Accepted: 30 April 2020
First Online: 12 May 2020
: Authors declare no conflict of interest.
: The research was approved by the Medical University of Silesia (ref. KNW/0022/KB1/134/15).Informed consent: All subject gave written informed consent before their inclusion in the study.