Funding for this research was provided by:
Deutsche Forschungsgemeinschaft (SFB TR 228)
Received: 16 April 2020
Accepted: 16 June 2020
First Online: 28 September 2020
Ethics approval and consent to participate
: This research received an ethics approval from the Ethical Committee of the Faculty of Medicine at the University of Cologne. Prior to interviews, all interviewees were informed about the purposes of the research and how the results would be used and gave their consent to participate.
: Not applicable.
: The authors declare that they have no competing interests.