Funding for this research was provided by:
National Institute for Health Research (17/63/76)
Received: 21 April 2020
Accepted: 23 June 2020
First Online: 12 August 2020
Ethics approval and consent to participate
: Given that this is a secondary analysis of anonymised data that were already publicly available, ethics approval and consent to participate were not applicable.
: As above, consent for publication was not applicable.
: None declared