Funding for this research was provided by:
Deutsche Forschungsgemeinschaft (HE 1875/29-1, HE 7312/4-1, DFG HA 5399/5-1)
Received: 8 April 2020
Accepted: 28 July 2020
First Online: 10 September 2020
Ethics approval and consent to participate
: The study was approved by the University of Freiburg Ethics Committee and informed consent was obtained from all participants.
: Not applicable.
: The authors declare that they have no competing interests.