Funding for this research was provided by:
Received: 18 July 2020
Accepted: 5 April 2021
First Online: 15 April 2021
: Before data collection, consent from the Ethics Committee of the University of Regensburg was obtained (19.09.2018; 18-1125-104). Informed patient consent was waived because of the retrospective study design.
: Not applicable.
: The authors declare that they have no competing interests.