1. Pediatric Hematology/Oncology, University Children’s Hospital Bonn, Bonn, Germany
2. Department of Medical Biometry, Informatics, and Epidemiology, University Hospital Bonn, Bonn, Germany
3. Pediatric Hematology/Oncology, Hannover Medical School, Hannover, Germany
4. Pediatric Hematology/Oncology, Children’s Hospital Augsburg, Germany
5. Department of Medical Psychology and Medical Sociology, University of Leipzig, Germany
6. German Childhood Cancer Registry, Institute for Medical Biostatistics, Epidemiology, and Informatics, University of Mainz, Mainz, Germany
7. Institute for Biostatistics and Clinical Research, University of Münster, Münster, Germany
8. Pediatric Hematology/Oncology, University Children’s Hospital Lübeck, Germany
9. Pediatric Hematology/Oncology, University Children’s Hospital Hamburg, Germany
10. Division of Epidemiology and Health Services Research, Institute of Medical Biostatistics, Epidemiology, and Informatics, Mainz, Germany