Funding for this research was provided by:
Received: 3 February 2021
Accepted: 10 August 2021
First Online: 19 August 2021
: Institutional Review Board (IRB) approval was obtained from the Ethics Committee of the University of Regensburg (ID 17-895-101). Patient consent for participation was waived.
: Patient consent for publication was not required.
: CK and HB are still and PL was employed by the VBG.