1. Department of Immunology, Genetics and PathologyUppsala UniversityUppsala Sweden
2. Department of Global Public Health and Primary CareUniversity of BergenBergen Norway
3. Cancer Registry of NorwayOslo Norway
4. Department of MedicineClinical Epidemiology Unit, Karolinska InstitutetStockholm Sweden
5. Department of PharmacoepidemiologyNorwegian Institute of Public HealthBergen Norway
6. Information Services DepartmentNational Institute for Health and Welfare (THL)Helsinki Finland
7. Department of Neurobiology, Care Sciences and SocietyKarolinska InstitutetStockholm Sweden
8. Cancer Society of FinlandFinnish Cancer RegistryHelsinki Finland
9. Department of PaediatricsUniversity of Helsinki and Helsinki University HospitalHelsinki Finland
10. Department of Clinical EpidemiologyAarhus University HospitalAarhus Denmark
11. Division of Cancer Epidemiology and Genetics, Department of Health and Human ServicesNational Cancer Institute, National Institutes of HealthBethesda MD