Received: 7 January 2019
Accepted: 19 June 2019
First Online: 18 July 2019
Ethics approval and consent to participate
: Ethical approval was obtained from the University of Aberdeen, College Ethics Review Board (CERB reference: CERB/2015/9/1239). All participants gave written consent for their participation and audio recording.
: All participants gave written consent for the anonymised publication of quotes for research purposes.
: The authors declare that they have no competing interests.