1. Department of Pediatrics and Adolescent Medicine, Division of Pediatric Hematology and Oncology, Medical Center, Faculty of Medicine, University of Freiburg, Freiburg, Germany
2. Clinical Chemistry and Laboratory Medicine, Medical Center, Faculty of Medicine, University of Freiburg, Freiburg, Germany
3. Division of Epigenomics and Cancer Risk Factors, German Cancer Research Center, Heidelberg, Germany
4. Multicenter Consortium, The German Cancer Consortium, Heidelberg, Germany