1. International Agency for Research on Cancer (IARC/WHO), Environment and Lifestyle Epidemiology Branch Lyon France
2. Department of Paediatric Oncology, Haematology and Clinical Immunology, Center for Child and Adolescent Health, Medical Faculty Heinrich Heine University Düsseldorf Germany
3. Division of Childhood Cancer Epidemiology Institute of Medical Biostatistics, Epidemiology and Informatics (IMBEI), University Medical Center of the Johannes Gutenberg University Mainz Mainz Germany