Funding for this research was provided by:
Bundesministerium für Bildung und Forschung (01KR1804B, 01KR1804C, 01EF1802AC)
Received: 12 November 2020
Accepted: 12 May 2021
First Online: 2 June 2021
: The study was approved by the Internal Review Board of the University of Marburg (approval number: 2019-58 k). Participants received study information and provided informed consent. Data were collected anonymously.
: Not applicable.
: The authors declare that they have no competing interests.