1. Department of Health, Office of the Chief Medical Officer, 79 Whitehall, London SW1A 2NS, UK
2. Research Department of Infection and Population Health, University College London, 222 Euston Road, London NW1 2DA, UK
3. North East Health Protection Team, Public Health England, Gallowgate, Newcastle-upon-Tyne NE1 4WH, UK
4. Genomics England, Queen Mary University of London, Dawson Hall, Charterhouse Square, London EC1M 6BQ, UK
5. Public Health, Epidemiology and Biostatistics, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK