Funding for this research was provided by:
Bundesministerium für Bildung und Forschung
Received: 20 April 2020
Accepted: 18 August 2020
First Online: 28 August 2020
Ethics approval and consent to participate
: Not applicable as only anonymized data have been collected for this study.
: Not applicable.
: All authors (AHS, HB, PF, SS) declare that they have no financial or non-financial competing interests. All authors declare that they have no financial relationships that might be perceived as a potential conflict of interest.