Funding for this research was provided by:
Narodowe Centrum Nauki (UMO-2013/09/B/NZ6/00746)
Received: 8 December 2020
Accepted: 2 June 2021
First Online: 10 June 2021
: The study was approved by the Bioethics Committee of the Medical University of Lodz (Approval No. RNN/166/14/14/KE). All the study subjects provided their informed consent to take part.
: Not applicable.
: The authors declare no conflict of interest.