Funding for this research was provided by:
CLAHRC for NW London
Received: 25 March 2019
Accepted: 4 May 2020
First Online: 19 May 2020
Ethics approval and consent to participate
: This study was granted ethical approval by the Imperial College London research ethics committee. Informed consent was obtained from all participants. The consent obtained from study participants was written.
: Not applicable.
: The authors have no competing interests to declare.