Funding for this research was provided by:
University College London (IMPACT studentship)
Received: 29 July 2020
Accepted: 10 November 2020
First Online: 14 December 2020
Ethics approval and consent to participate
: This analysis was approved by the UCL student Research Ethics Committee (5683/001). PHE has authority under the Health and Social Care Act 2012 to hold and analyse national surveillance data for public health and research purposes.
: Not applicable.
: There are no conflicts of interest to declare.