Funding for this research was provided by:
Public Health England
Accepted: 27 August 2020
First Online: 15 October 2020
Ethics approval and consent to participate
: The study was approved by the Ministry of Justice and Public Health England’s respective legal teams to ensure adherence to Data Protection Act, 1998 principles, in addition to sign-off from PHE’s Caldecott Guardian and the Office for Data Release. The study was also approved by Middlesex University ethics number 1555.
: Not applicable.
: The authors declare that they have no competing interests.