Funding for this research was provided by:
UCL Hospitals Charitable Foundation (7083)
UK Research and Innovation (ES/S002588/1)
Leverhulme Trust (PLP-2018-007)
Received: 22 May 2020
Accepted: 3 September 2020
First Online: 21 September 2020
Ethics approval and consent to participate
: The study received ethics approval from the University College London (UCL) ethics committee <b>(14895/002)</b> all participants provided written informed consent to participate.
: Not applicable.
: The authors declare they have no competing interests.