Funding for this research was provided by:
Received: 23 November 2020
Accepted: 18 February 2021
First Online: 10 March 2021
: All procedures contributing to this work complied with the ethical standards of the English National Health Service. Ethics approvals were gained from London Bloomsbury Research Ethics Committee (ref: 16/LO/2160). Informed written consent was obtained from all individual participants included in the study.
: Not applicable.
: The authors declare that they have no competing interests.