Funding for this research was provided by:
The Research Council of Norway (256644/H10)
Received: 22 July 2019
Accepted: 31 October 2019
First Online: 20 November 2019
Ethics approval and consent to participate
: The Regional Committees for Medical and Health Research Ethics (REC) approved the study (2016/2215 REK sør-øst B). We guaranteed the participants confidentiality and informed them of their right to withdraw from the study at any stage. We obtained written informed consent from all of the participants. To ensure anonymity, we safely stored the data and assigned each informant a non-identifying code.
: Not applicable.
: The authors declare that they have no competing interests.