1. Centre for Epidemiology and Biostatistics, Melbourne School of Population and Global Health, The University of Melbourne, Melbourne; Victoria Australia
2. Cancer Council Victoria, Melbourne; Victoria Australia
3. Victorian Cervical Cytology Registry; Victorian Cytology Service, East Melbourne; Victoria Australia
4. National HPV Vaccination Program Register; Victorian Cytology Service, East Melbourne; Victoria Australia
5. Department of Oncology and Dysplasia; The Royal Women's Hospital, Parkville; Victoria Australia
6. Department of Obstetrics and Gynaecology; The University of Melbourne, Carlton; Victoria Australia
7. Victorian Cytology Service; Carlton Victoria Australia