Funding for this research was provided by:
National Institute for Health Research (ICA-CDRF-2017-03-070)
Received: 10 May 2020
Accepted: 14 August 2020
First Online: 16 September 2020
Ethics approval and consent to participate
: This study has been reviewed and given favourable opinion by the East of England Research Ethics Committee (19/EE/0052).
: Not applicable.
: The authors declare that they have no competing interests.