Funding for this research was provided by:
Received: 8 November 2018
Accepted: 1 July 2019
First Online: 9 July 2019
Ethics approval and consent to participate
: According to Dutch law, our study did not need approval by a medical ethics committee [CitationRef removed]. Respondents received written and verbal information about participation. Before the interview started the respondents signed an informed consent form. Within this manuscript all identifiable data was removed.
: Respondents signed a consent for publication.
: The authors declare that they have no competing interests.