Funding for this research was provided by:
Bundesministerium für Verkehr und Digitale Infrastruktur (Inhouse order)
Bundesministerium für Wirtschaft und Technologie (19F2007A)
Projekt DEAL
Article History
Received: 25 February 2020
Accepted: 24 November 2020
First Online: 21 December 2020
Ethics approval and consent to participate
: Not applicable.
: Not applicable.
: The authors declare that they have no competing interests.