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Article History

Received: 18 May 2017

Accepted: 6 February 2018

First Online: 26 February 2018

Ethics approval and consent to participate

: All participants approved to being interviewed and recorded. The data material was anonymized after transcription. The analysis and presentation of data did not allow for the identification of individual participants. The ethics committee of the University of Regensburg was consulted and decided that there were no ethical concerns that would require further authorized approval processes if the data material were anonymized before analysis (ref no 14-160-0162).

: All interview quotes have been de-identified, so the presented data cannot be attributed to single participants.

: The authors declare that they have no competing interests.

: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.