Funding for this research was provided by:
Health Technology Assessment Programme (11/15/13)
Received: 13 July 2018
Accepted: 23 January 2019
First Online: 8 February 2019
Ethics approval and consent to participate
: Ethical approval was given by Bradford Leeds NHS REC committee. All participants provided written informed consent before participation. Written informed consent to publish direct quotes was obtained from study participants.
: Not applicable.
: The authors declare that they have no competing interests.
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