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Authors
Kretschmann, Lutz http://orcid.org/0000-0002-4857-1289
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Funding
Funding for this research was provided by:
Hamburger Behörde für Wirtschaft, Verkehr und Innovation
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Article History
Received: 13 February 2020
Accepted: 20 August 2020
First Online: 19 October 2020
Competing interests
: The authors declare that they have no competing interests.
