1. Centre for Mathematics of Precision Healthcare, Department of Mathematics, Imperial College London, London, UK
2. Department of Mathematics, Simon Fraser University, Burnaby, BC V5A 1S6, Canada
3. University College London, London, UK
4. National Infection Service, Public Health England, London, UK
5. Usher Institute of Population Health Sciences and Informatics, University of Edinburgh, Edinburgh, UK
6. Institute for Global Health, University College London, London, UK