Funding for this research was provided by:
Received: 1 July 2020
Accepted: 29 January 2021
First Online: 9 February 2021
Ethics approval and consent to participate
: This study was approved by the ethics committee of the University of Leipzig (reference number: 196/19-ek). Participants have given consent for their data to be used in the research.
: Not applicable.
: The authors declare that they have no competing interests.