1. Division of Molecular Genetic Epidemiology, German Cancer Research Center, Heidelberg, Germany;
2. Division of Preventive Oncology, National Center for Tumor Diseases (NCT), Heidelberg, Germany;
3. Finnish Cancer Registry, Institute for Statistical and Epidemiological Cancer Research, Helsinki, Finland;
4. School of Health Sciences, University of Tampere, Tampere, Finland;
5. Danish Cancer Society Research Center, Copenhagen, Denmark;
6. Icelandic Cancer Registry, Reykjavik, Iceland;
7. Faculty of Medicine, University of Iceland, Reykjavik, Iceland;
8. Center for Primary Health Care Research, Lund University, Malmö, Sweden; and
9. Norwegian Cancer Registry, Oslo, Norway