Funding for this research was provided by:
Bundesministerium für Bildung, Wissenschaft, Forschung und Technologie (FKZ 01UT1419A-B)
Projekt DEAL
Article History
Received: 19 May 2020
Accepted: 12 August 2020
First Online: 8 September 2020
Ethics approval and consent to participate
: Not applicable.
: Not applicable.
: The authors declare that they have no competing interests.