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Danish Cancer Society Research Center, Copenhagen, Denmark
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Paediatric Department, Skejby Hospital, Aarhus, Denmark
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Swedish Cancer Registry, National Board of Health and Welfare, Stockholm, Sweden
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Division of Paediatric Oncology and Haematology, University Children’s Hospital, Lund, Sweden
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Cancer Registry of Norway, Institute of Population-based Cancer Research, Oslo, Norway
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Finnish Cancer Registry, Cancer Society of Finland, Helsinki, Finland
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Turku University Hospital, Department of Paediatrics, Division of Pedriatric Hematology and Oncology, Turku Finland
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Icelandic Cancer Registry, Icelandic Cancer Society, Reykjavik, Iceland
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Department of Cancer Epidemiology, Lund University, Lund, Sweden
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