Funding for this research was provided by:
Bundesministerium für Bildung und Forschung (01DR20007B)
Article History
Received: 11 February 2021
Accepted: 23 February 2021
First Online: 19 March 2021
Declarations
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: On behalf of all the authors, the corresponding author confirms that neither the article nor portions of it have been previously published elsewhere; the manuscript is not under consideration for publication in another journal, and all authors consent to the publication of the manuscript in Circular Economy and Sustainability should the article be accepted by the Editor-in-chief upon completion of the refereeing process.
: The authors declare no competing interests.