Funding for this research was provided by:
Dept of Health (016/0118)
Article History
Received: 24 October 2017
Accepted: 4 June 2019
First Online: 10 July 2019
Ethics approval and consent to participate
: Obtained from the National Research Ethics Service, following referral to the Brighton and Mid-Sussex Research Ethics Committee in its role as a multi-centre research ethics committee (ref 04/Q1907/48 amendment Am02 March 2015).
: Not applicable.
: All authors have completed the Unified Competing Interest form at ExternalRef removed (available on request from the corresponding author) and all authors want to declare: (1) financial support for the submitted work from the policy research programme, Department of Health. All authors also declare: (2) no financial relationships with commercial entities that might have an interest in the submitted work; (3) no spouses, partners, or children with relationships with commercial entities that might have an interest in the submitted work; (4) no non-financial interests that may be relevant to the submitted work.