1. Finnish Cancer Registry, Institute for Statistical and Epidemiological Cancer Research Helsinki Finland
2. Occupational Cancer Research Center, Ontario Health Ontario Canada
3. Danish Cancer Society Research Center Copenhagen Denmark
4. Department of Research, Cancer Registry of Norway Oslo Norway
5. University of Copenhagen Copenhagen Denmark
6. National Institute of Occupational Health (STAMI) Oslo Norway
7. Tampere University Tampere Finland
8. Karolinska Institutet Stockholm Sweden
9. Icelandic Cancer Registry Reykjavik Iceland
10. Center of Public Health Sciences, Faculty of Medicine University of Iceland Reykjavik Iceland
11. International Agency for Research on Cancer, World Health Organization Lyon France