Bibliographical noteSmith and Rubin are affiliated to the National Institute for Health Research Health Protection Research Unit (NIHR HPRU) in Emergency Preparedness and Response at King’s College London in partnership with Public Health England (PHE), in collaboration with the University of East Anglia and Newcastle University [@EPR_HPRU]. Rubin is also supported by the UK Public Health Rapid Support team, funded by the United Kingdom Department of Health and Social Care. Yardley is partly supported by NIHR Applied Research Collaboration (ARC)-West, NIHR Health Protection Research Unit (HPRU) for Behavioural Science and Evaluation, and the NIHR Southampton Biomedical Research Centre (BRC). The views expressed are those of the author(s) and not necessarily those of the NHS, the NIHR, the Department of Health and Social Care or Public Health England. Michie is affiliated to the National Institute for Health Research Behaviour Science Policy Research Unit at University College London.
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