Funding for this research was provided by:
NIHR Oxford Biomedical Research Centre (BRC-1215-20008)
Received: 21 March 2020
Accepted: 4 June 2020
First Online: 11 July 2020
Ethics approval and consent to participate
: This study was approved by the University of Oxford Central University Research Ethics Committee (R61467/ RE001). All participants gave audio-recorded, verbal consent to take part.
: Not applicable.
: Authors declare no competing interests.