Received: 24 April 2021
Accepted: 11 August 2021
First Online: 12 September 2021
: The research project was approved by the responsible ethics committee (Ärztekammer Berlin, No.: Eth-12/19). We confirm that all methods were performed in accordance with the relevant guidelines and regulations of the ethics committee of <i>Ärztekammer Berlin</i>.
: Participation was voluntary, and the study participants gave informed written consent.
: Not applicable.
: The authors declare no conflict of interest.