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