Received: 11 October 2021
Accepted: 18 February 2022
First Online: 4 April 2022
: This study was performed in compliance with the Helsinki Declaration and approved by the ethics committee of the University of Regensburg (Code: 20-2015-104).
: This manuscript has not been published elsewhere and is not under consideration by another journal.
: The authors declare that they have no competing interests.