Funding for this research was provided by:
Received: 27 July 2017
Accepted: 7 March 2018
First Online: 15 March 2018
Ethics approval and consent to participate
: Ethics approval was not applicable for the type of human data presented in this study, as detailed in official documents by the German Research Foundation (DFG) and the German Society for Sociology (DGS) [CitationRef removed,CitationRef removed]. We additionally followed the ethical principles of the Helsinki declaration, the DFG and DGS. Accordingly participants of the focus groups gave informed consent.
: Not applicable.
: The authors declare that they have no competing interests.
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