Funding for this research was provided by:
National Institute for Health Research
Received: 9 May 2020
Accepted: 9 August 2020
First Online: 3 September 2020
Ethics approval and consent to participate
: Ethical approval for the FREED-Up study was granted by the Camberwell St. Giles Research Ethics Committee (ref: 16/LO/1882) and NHS Health Research Authority.
: Not applicable.
: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.