Funding for this research was provided by:
Bundesministerium für Bildung und Forschung (016Y1113A, 016Y1113B)
Received: 3 August 2019
Accepted: 15 July 2020
First Online: 5 August 2020
Change Date: 8 December 2020
Change Type: Update
Change Details: Open Access Funding note was added to backmatter text of the article. This article has been updated to correct this.
Ethics approval and consent to participate
: Ethical approval was obtained from the responsible ethics committees of the Martin Luther University Halle-Wittenberg (ID: 2015–164) and the Ludwig-Maximilians-Universität München (ID: 760–15). All the participants gave their written informed consent prior to data collection.
: Not applicable.
: The authors declare that they have no competing interests.