Funding for this research was provided by:
Bundesministerium für Bildung und Forschung (01EL2001)
Received: 22 December 2020
Accepted: 17 January 2021
First Online: 1 February 2021
Ethics approval and consent to participate
: The study trial (grant number: BMBF/DLRFKZ: 01EL2001) was approved by the Ethics Committee of the University of Kassel on June 3, 2020. The committee assessed the planned project as ethically unobjectionable. Written consent to participate will be obtained from all study participants.
: Not applicable.
: The authors declare that they have no competing interests.