Funding for this research was provided by:
Health Technology Assessment Programme (15/170/02)
Received: 19 May 2020
Accepted: 12 November 2020
First Online: 3 December 2020
Ethics approval and consent to participate
: The study was approved by the UK Health Research Authority Approval (HRA; 11/11/2017) and the London - Dulwich Research Ethics Committee (11/09/2017) (reference: 17/LO/1463). Written informed consent was obtained for all participants prior to taking part.
: Not applicable, as no identifiable material is included.
: The authors declare that they have no competing interests.