1. National Institute for Health Research Health Protection Research Unit in Modelling Methodology and Medical Research Council Centre for Global Infectious Disease Analysis, Imperial College London School of Public Health, London, United Kingdom
2. Centre for Applied Statistics Courses, UCL Great Ormond Street Institute of Child Health, London, United Kingdom
3. National Institute for Health Research Health Protection Research Unit in Evaluation of Interventions, University of Bristol, Bristol, United Kingdom
4. Population Health Sciences, University of Bristol, Bristol, United Kingdom
5. Modelling and Economics Unit, National Infection Service, Public Health England, London, United Kingdom