Funding for this research was provided by:
Bundesministerium für Bildung und Forschung (01GY1604)
Received: 15 April 2019
Accepted: 15 July 2020
First Online: 30 July 2020
Ethics approval and consent to participate
: Ethics approval was provided by the ethics committee of Charité – Universitätsmedizin Berlin (EA1/361/16). All participants gave written informed consent to participate in the study.
: Not applicable.
: The authors declare that they have no competing interests.