1. Finnish Cancer Registry, Helsinki, Finland
2. Department of Pathology, Vejle Hospital, Lillebaelt Hospital, Region of Southern Denmark, Vejle, Denmark
3. Department of Laboratory Medicine, Karolinska Institutet, Stockholm, Sweden
4. Regional Cancer Center Stockholm-Gotland, Stockholm, Sweden
5. Section for Cervical Cancer Screening, Cancer Registry of Norway, Oslo, Norway
6. Cancer Detection Clinic, The Icelandic Cancer Society, Reykjavik, Iceland