Funding for this research was provided by:
Research for Patient Benefit Programme (PB-PG-1111-26063)
Received: 10 August 2020
Accepted: 8 January 2021
First Online: 21 January 2021
Ethics approval and consent to participate
: Participants provided written informed consent prior to enrolment in the study. The study obtained ethical approval from Camden and Islington Research Ethics Committee (13/LO/1309).
: Not applicable.
: The authors declare that they have no competing interests.