1. Finnish Cancer Registry, Institute for Statistical and Epidemiological Cancer Research, Helsinki, Finland;
2. Faculty of Social Sciences, University of Tampere, Tampere, Finland;
3. Danish Cancer Society, Copenhagen, Denmark;
4. Danish Cancer Registry, The Danish Health Data Authority, Copenhagen, Denmark;
5. Swedish Cancer Registry, the Swedish National Board of Health and Welfare, Stockholm, Sweden;
6. Regional Cancer Centre Uppsala-Örebro, Uppsala, Sweden;
7. Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden;
8. Icelandic Cancer Registry, Icelandic Cancer Society, Reykjavik, Iceland;
9. Faculty of Medicine, University of Iceland, Reykjavik, Iceland;
10. Department of Pathology, University of Helsinki and HUSLAB, Helsinki University Hospital, Helsinki, Finland;
11. Cancer Registry of Norway, Oslo, Norway