Funding for this research was provided by:
Medical Research Council (MR/M012190/1)
Received: 24 July 2020
Accepted: 14 October 2020
First Online: 23 November 2020
Ethics approval and consent to participate
: The study has approval by a Multicentre Research Ethics Committee (Scotland A Research Ethics Committee). All participants provided written informed consent.
: Not applicable.
: The authors declare that they have no competing interests.