[1] Sci Inst Publ Hlth, Canc Epidemiol Unit, Brussels, Belgium
[2] Sci Inst Publ Hlth, Belgian Canc Ctr, B-1050 Brussels, Belgium
[3] Vrije Univ Amsterdam, Med Ctr, Dept Pathol, Amsterdam, Netherlands
[4] Vrije Univ Amsterdam, Med Ctr, Dept Clin Epidemiol & Biostat, Amsterdam, Netherlands
[5] Royal Infirm Edinburgh NHS Trust, Scottish HPV Reference Lab, Edinburgh, Midlothian, Scotland
[6] Univ Ljubljana, Fac Med, Inst Microbiol & Immunol, Ljubljana, Slovenia