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