1. Cancer Prevention Group, School of Cancer & Pharmaceutical Sciences, Faculty of Life Sciences & Medicine King's College London London UK
2. Cytology Department, Manchester Royal Infirmary Manchester University NHS Foundation Trust Manchester UK
3. University Research Clinic for Cancer Screening, Department of Public Health Programmes Randers Regional Hospital Randers Denmark
4. Department of Clinical Medicine Aarhus University Aarhus Denmark
5. Scottish HPV Reference Laboratory, Royal Infirmary of Edinburgh, NHS Lothian Scotland Edinburgh UK