1 Department of Paediatric Oncology, Haematology and Clinical Immunology, Center for Child and Adolescent Health, Medical Faculty, Heinrich-Heine-University, Moorenstraße 5, 40225, Düsseldorf, Germany. Arndt.Borkhardt@med.uni-duesseldorf.de.
2 German Cancer Consortium (DKTK), partnering site Essen/ Düsseldorf, Düsseldorf, Germany. Arndt.Borkhardt@med.uni-duesseldorf.de.
3 Environment and Lifestyle Epidemiology Branch, International Agency for Research on Cancer, World Health Organization (IARC/WHO), 150 cours Albert Thomas, 69372, Lyon, France.
4 Division of Childhood Cancer Epidemiology, Institute of Medical Biostatistics, Epidemiology and Informatics (IMBEI), University Medical Center of the Johannes Gutenberg University Mainz, Obere Zahlbacher Straße 69, 55131, Mainz, Germany.
5 Department of Prevention and Evaluation, Leibniz Institute for Prevention Research and Epidemiology-BIPS, Achterstraße 30, 28359, Bremen, Germany.