Funding for this research was provided by:
Bundesministerium für Bildung und Forschung (#16SV5536K, #16SV5537, #16SV5538, #16SV5837, #01UW0808, 01GL1716A, and 01GL1716B)
Received: 26 July 2020
Accepted: 30 November 2020
First Online: 21 December 2020
Ethics approval and consent to participate
: All participants gave written informed consent to the study protocol which was approved by the Ethics Committee of the Charité-Universitätsmedizin Berlin (number of the ethical approval: EA2/ 029/09).
: Not applicable.
: The authors have no conflict of interest to declare.