1. Clinic for Radiotherapy Radiooncology University Hospital Muenster Muenster Germany
2. Department for Phoniatrics and Pedaudiology University Hospital Muenster, UKM Germany
3. Boyne Research Institute Drogheda Ireland
4. Pediatric Oncology and Hematology University Hospital for Children and Adolescents, University of Luebeck Luebeck Germany
5. Erasmus University Medical Centre (EMC) Rotterdam The Netherlands
6. German Childhood Cancer Registry, Institute of Medical Biostatistics, Epidemiology and Informatics (IMBEI) University Medical Center of the Johannes Gutenberg University Mainz Mainz Germany
7. Division of Childhood Cancer Epidemiology, German Childhood Cancer Registry, Institute of Medical Biostatistics, Epidemiology and Informatics (IMBEI) University Medical Center of the Johannes Gutenberg University Mainz Mainz Germany
8. Academisch Medisch Centrum bij de Universiteit van Amsterdam (AMC) Amsterdam The Netherlands
9. Princess Maxima Center for Pediatric Oncology (PMC), and University of Utrecht Utrecht The Netherlands
10. Pediatric Hematology and Oncology University Children's Hospital Muenster Muenster Germany
11. Department of Pediatric Hematology and Oncology University Hospital Bonn Bonn Germany
12. Institute of Social and Preventive Medicine, University of Bern Bern Switzerland
13. Department of Pediatrics, Inselspital, Bern University Hospital University of Bern Bern Switzerland
14. DOPO Clinic and Neuroncology Unit, Department of Hematology/Oncology IRCCS Istituto Giannina Gaslini (IGG) Genoa Italy
15. Department of Pediatrics Jena University Hospital Jena Germany
16. International Clinical Research Center, St. Anne's University Hospital Brno Brno Czech Republic
17. Department of Paediatric Oncology University Hospital Brno Brno Czech Republic
18. Childhood Cancer Research Group Danish Cancer Society Research Center Copenhagen Denmark
19. Pediatric and Adolescent Medicine, Juliane Marie Centre Copenhagen University Hospital, Rigshospitalet Copenhagen Denmark
20. Department of Pediatrics Aarhus University Hospital Aarhus Denmark
21. Motol Teaching Hospital Prague Czech Republic
22. Pediatric Hematology and Oncology Medical University of Graz Graz Austria
23. Pediatrics 5 (Oncology, Hematology, Immunology), Center for Pediatric, Adolescent, and Women's Medicine Stuttgart Cancer Center, Klinikum Stuttgart—Olgahospital Stuttgart Germany
24. Pediatric Oncology University Hospital Erlangen Erlangen Germany
25. Institute of Clinical Pharmacology Brandenburg Medical School Rüdersdorf Germany