Funding for this research was provided by:
Bundesministerium für Bildung und Forschung (BMBF 01GL1805)
Received: 5 November 2020
Accepted: 19 April 2021
First Online: 1 May 2021
: Ethics approval from the Committee of the Medical Centre – University of Freiburg (183/19; 23.07.2019 and 13.07.2020) and the ethics committees of Tübingen for the Tübingen and Filderstadt sites (561/2019BO1, 21.10.2019 and 12.08.2020) of Witten/Herdecke (150/2019, 31.07.2019 and 30.07.2020), Ulm (284/19, 01.08.2019 and 22.07.2020), and Essen (19–8908-BO, 18.02.2020 and 23.07.2020) were obtained. Berlin relies on the vote from Freiburg.Written informed consent to participate in the study is obtained from all participants.
: Not applicable.
: The authors declare that they have no competing interests.