Funding for this research was provided by:
Pomeranian Medical University in Szczecin
Article History
Received: 21 August 2020
Revised: 1 October 2020
Accepted: 16 October 2020
First Online: 26 October 2020
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: For this kind of study no ethics approval was required.
: As this was a retrospective analysis of the studies that had been published in the past, no consent to participate was necessary.
: Authors of this study grant the Publisher the sole and exclusive license of the full copyright.