Funding for this research was provided by:
Northern Health and Social Care Trust (grant number R&D 010)
Puffin Trust (research grant 2016)
Received: 31 July 2019
Accepted: 25 October 2019
First Online: 8 November 2019
Ethics approval and consent to participate
: Ethical approval was sought and granted from London-Bromley Research Ethics Committee (REC reference 17/LO/0268). Given the non-identifiable nature of the data, subject consent was not required.
: Not applicable
: CS and SH are employed by the Northern Health and Social Care Trust. All other authors declare they have no competing interests.