Mwanza Intervention Trials Unit, Mwanza Intervention Trials Unit, Mwanza Intervention Trials Unit, Government of the United States of America - HPV Serology Laboratory, Mwanza Intervention Trials Unit, Mwanza Intervention Trials Unit, Government of the United States of America - HPV Serology Laboratory, National Institute for Medical Research (NIMR) - Mwanza Medical Research Centre, Mwanza Intervention Trials Unit, University of York, Mwanza Intervention Trials Unit, London School of Hygiene & Tropical Medicine, Mwanza Intervention Trials Unit, Gran Via de l'Hospitale, London School of Hygiene & Tropical Medicine, Mwanza Intervention Trials Unit, Mwanza Intervention Trials Unit, London School of Hygiene & Tropical Medicine - Department of Clinical Research, Institut Català d'Oncologia - Cancer Epidemiology Research Programme, Karolinska Institutet - Department of Laboratory Medicine, London School of Hygiene & Tropical Medicine - MRC International Statistics & Epidemiology Group, University of York - York Biomedical Research Institute and London School of Hygiene & Tropical Medicine - Faculty of Epidemiology and Population Health