1. Department of Pediatric Hematology and Oncology; University Children's Hospital Erlangen; Germany
2. Clinic of Pediatrics; Dortmund Germany
3. German Childhood Cancer Registry (GCCR); Institute of Medical Biostatistics; Epidemiology and Informatics (IMBEI); University Medical Center Mainz; Germany
4. Department of Pediatric Oncology and Hematology; University Children's Hospital Greifswald; Germany
5. Division of Pediatric Hematology and Oncology; Department of Pediatrics and Adolescent Medicine; Medical University of Graz; Austria
6. Pediatric Hematology and Oncology; University Children's Hospital Kiel; Germany
7. Pediatric Hematology and Oncology; University Children's Hospital Tuebingen; Germany
8. Pediatric Hematology and Oncology; University Children's Hospital Goettingen; Germany
9. Pediatric Hematology and Oncology; University Children's Hospital Hannover; Germany
10. Department of Paidopathology; University of Kiel; Germany
11. Clinical Tumor Registry; Department of Surgery; University of Erlangen; Germany
12. Department of Pediatric Surgery; University Children's Hospital Hannover; Germany
13. Tumor Registry; University of Erlangen-Nuernberg; Germany
14. Pediatric Oncology and Hematology; Charité University Medicine, Berlin; Germany
15. Department of Pediatric Hematology and Oncology; University Children's Hospital Wuerzburg; Germany
16. Department of Pediatric Hematology and Oncology; University Children's Hospital Dresden; Germany
17. Institute of Pharmacology of Natural Products and Clinical Pharmacology; University of Ulm; Germany