Funding for this research was provided by:
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung (100019_159365/1)
Received: 23 May 2020
Accepted: 6 October 2020
First Online: 15 October 2020
Ethics approval and consent to participate
: The study has been approved by the Ministries of Education of the federal states. Details about consent to participate are described in the Methods section.
: Not applicable.
: The authors declare that they have no competing interests.