1. Institute of Cancer Sciences, University of Manchester, Manchester, UK
2. Lowy Cancer Research Centre, Prince of Wales Clinical School, University of New South Wales, Sydney, NSW, Australia
3. Non-Communicable Disease Epidemiology Unit, London School of Hygiene and Tropical Medicine, London, UK
4. Department of Virology, Central Manchester University Hospitals NHS Foundation Trust, Manchester, UK
5. Institute of Population Health, University of Manchester, Manchester, UK
6. Manchester Cytology Centre, Central Manchester University Hospitals NHS Foundation Trust, Manchester, UK