1. Faculty of Social Sciences, University of Tampere, Tampere, Finland;
2. Cancer Registry of Norway, Oslo, Norway;
3. Department of Community Medicine, Faculty of Health Sciences, University of Tromsø, The Arctic University of Norway, Tromsø, Norway;
4. Genetic Epidemiology Group, Folkhälsan Research Center, Helsinki, Finland;
5. Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden;
6. Icelandic Cancer Registry, Reykjavik, Iceland;
7. Faculty of Medicine, University of Iceland, Reykjavik, Iceland;
8. Center for Epidemiology and Screening, Institute of Public Health, University of Copenhagen, København, Denmark;
9. Finnish Cancer Registry, Institute for Statistical and Epidemiological Cancer Research, Helsinki, Finland