Funding for this research was provided by:
Bundesministerium für Wirtschaft und Energie
RWTH Aachen
RWTH Aachen
Article History
Received: 30 November 2020
Revised: 20 January 2021
Accepted: 8 February 2021
First Online: 25 February 2021
Conflict of interest
: M. Cardaun, R. Schelenz, G. Jacobs and T. Duda declare that they have no competing interests.