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Authors
Appel, Helmut
Gerlach, Alexander L.
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Funding
Funding for this research was provided by:
Universität zu Köln
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Article History
Received: 19 August 2024
Accepted: 29 August 2025
First Online: 6 October 2025
Declarations
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: All authors declare that they have no conflict of interest.
: All studies were performed in line with the principles of the Declaration of Helsinki and were approved by the ethics commission of the Faculty of Humanities at the University of Cologne (May 31st, 2021; reference no. HAHF0115, including amendments for subsequent studies).
: Informed consent was obtained from all individual participants included in the studies.
