1. Danish Cancer Society Research Center Unit of Virus, Lifestyle and Genes Copenhagen Denmark
2. Unit of Statistics and Pharmacoepidemiology Danish Cancer Society Research Center Copenhagen Denmark
3. Department of Oral Pathology, Institute of Dentistry University of Turku Turku Finland
4. Department of Pathology University of Turku and Turku University Hospital Turku Finland
5. Department of Gynecology University of Copenhagen and Copenhagen University Hospital Copenhagen Denmark