1. Modelling and Economics Unit, National Infection Service, Public Health England, London, UK
2. PharmacoTherapy, -Epidemiology & -Economics, Department of Pharmacy, University of Groningen, Groningen, The Netherlands
3. MRC Centre for Outbreak Analysis and Modelling, Department of Infectious Disease Epidemiology, Imperial College School of Public Health, London, UK
4. Health Protection Scotland, NHS National Services Scotland, Glasgow, UK