1. Institute of Medical Virology and Epidemiology of Viral Diseases, University Hospital Tübingen, Tübingen, Germany
2. Frauenärzte am Staden, Saarbrücken, Germany
3. Centre for Cancer Prevention, Queen Mary University of London, London, United Kingdom
4. Cancer Prevention Group, School of Cancer & Pharmaceutical Sciences, Faculty of Life Sciences & Medicine, King’s College London, London, United Kingdom
5. Department of Pathology and Neuropathology, University Hospital Tübingen, Tübingen, Germany
6. Department of Gynaecology and Obstetrics, University Hospital Tübingen, Tübingen, Germany
7. Medical Faculty Tübingen, Institute for Clinical Epidemiology and Applied Biometry, Tübingen, Germany