1 Department of Medicine and Access, Royal Surrey NHS Foundation Trust, Guildford, United Kingdom; Department of Clinical and Experimental Medicine, University of Surrey, Guildford, United Kingdom; Institute of Liver Studies, King's College Hospital, London, United Kingdom.
2 UCL Collaborative Centre for Inclusion Health, Institute of Epidemiology and Health Care, London, United Kingdom.
3 Division of Infection and Immunity, University College London, and NIHR Biomedical Research Centre, UCL Hospitals NHS Foundation Trust, London, United Kingdom.
4 Mass Gatherings and Global Health Network, London, United Kingdom.