1. Unit of Epidemiology, Institute of Environmental Medicine, Karolinska Institutet, SE-171 77 Stockholm, Sweden
2. Neurogenetics Unit, Department of Molecular Medicine and Surgery, Karolinska Institutet, and Center for Molecular Medicine, Karolinska University Hospital, L8:00, SE-171 76 Stockholm, Sweden
3. Section of Environment and Radiation, International Agency for Research on Cancer (IARC), 69372 Lyon, France
4. Department of Epidemiology and Public Health, Swiss Tropical and Public Health Institute, 4002 Basel, Switzerland
5. University of Basel, 4003 Basel, Switzerland
6. The Cancer Registry of Norway, NO-0379 Oslo, Norway
7. National Institute of Occupational Health, NO-0360 Oslo, Norway
8. Department of Oncology, University Children's Hospital of Zurich, 8032 Zurich, Switzerland
9. Unit of Survivorship, The Danish Cancer Society Research Centre, DK-2100 Copenhagen, Denmark
10. Oncology Department, Finsen Centre, Rigshospitalet, DK-2100 Copenhagen, Denmark
11. Swiss Childhood Cancer Registry, Institute of Social and Preventive Medicine, University of Bern, 3012 Bern, Switzerland
12. Childrens Cancer Center, Queen Silvia Childrens Hospital, SE-416 85 Gothenburg, Sweden
13. Department of Clinical Genetics, University Hospital Rigshospitalet, DK-2100 Copenhagen, Denmark