1. Institute of Social and Preventive Medicine, University of Bern, Bern, Switzerland
2. School of Social and Community Medicine, University of Bristol, Bristol, UK
3. Centre for Sexual Health and HIV Research, Research Department of Infection and Population Health, University College London, London, UK
4. Health Economics Facility, University of Birmingham, Birmingham, UK
5. Academic Directorate of Communicable Diseases, Sheffield Teaching Hospitals NHS Foundation Trust, Sheffield, UK
6. Brighton and Sussex Medical School, University of Brighton, Brighton, UK
7. Infectious Disease Epidemiology Unit, London School of Hygiene and Tropical Medicine, London, UK
8. Modelling and Economics Unit, Health Protection Agency (now Public Health England), London, UK, and MRC Centre for Outbreak Analysis and Modelling, School of Public Health, Imperial College London, London, UK
9. Department of Infectious Disease Epidemiology, Faculty of Medicine, Imperial College London, London, UK