Funding for this research was provided by:
Received: 17 August 2021
Accepted: 9 December 2021
First Online: 16 December 2021
: The study was approved by the ethics commission of the Bavarian Medical Association (Approval No. 15016, 28/04/2015). From all participants written informed consent was obtained.
: Not applicable.
: The authors declare that they have no competing interests.