1. Oxford Vaccine Group, Department of Paediatrics, University of Oxford, Oxford, UK
2. Nuffield Department of Primary Care Health Sciences, University of Oxford, Oxford, UK
3. Bodleian Health Care Libraries, University of Oxford, Oxford, UK
4. Population Health Science, Bristol Medical School, University of Bristol, Bristol, UK
5. Modelling and Economics Unit, UK Health Security Agency, London, UK
6. South African Medical Research Council Vaccines and Infectious Diseases Analytics Research Unit, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
7. Department of Infectious Disease Epidemiology, London School of Hygiene and Tropical Medicine, London, UK