Funding for this research was provided by:
Public Health Research Programme (PR-R10-0514-12006)
Received: 4 December 2019
Accepted: 31 May 2020
First Online: 5 June 2020
Ethics approval and consent to participate
: Ethical approval was given by the Yorkshire and the Humber – Bradford Leeds NHS Research Ethics Committee [REC Ref 15/YH/0488]. All participants gave written informed consent to participate.
: Not applicable.
: The authors declare that they have no competing interests.