1. Unit of Cancer Epidemiology/Belgian Cancer Centre Scientific Institute of Public Health Brussels Belgium
2. Laboratory of Clinical Microbiology and Virology, Department of Medicine and Surgery University of Milano–Bicocca Monza Italy
3. Scottish HPV Reference Laboratory Royal Infirmary of Edinburgh Edinburgh Scotland UK
4. HPV Research Group, Centre for Reproductive Health University of Edinburgh Edinburgh Scotland UK
5. Department of Human Structure and Repair, Faculty of Medicine and Health Sciences University Ghent Ghent Belgium