Funding for this research was provided by:
Efficacy and Mechanism Evaluation Programme (14/23/18)
Received: 24 March 2020
Accepted: 8 May 2020
First Online: 12 June 2020
Ethics approval and consent to participate
: Ethical approval for this study has been approved and is overseen by the National Research Ethics Service Committee (London - Brent Research Ethics Committee, 16/LO/0913, 30 June 2016). We have obtained informed consent from all participants in the study.
: Not applicable.