Tomaszewski, Ryszard
Rutz, Erich
Mayr, Johannes
Dajka, Jerzy
Funding for this research was provided by:
University of Basel
Article History
Received: 24 June 2020
Accepted: 15 October 2020
First Online: 24 November 2020
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: This retrospective study was approved by the Ethics Committee of the Silesian Medical University, Katowice, Poland (PCN/0022/KB/99/20 dated June 5th, 2020).