1. Children's Hospital Augsburg Swabian Children's Cancer Center Stenglinstr. 2 86156 Augsburg Germany
2. Department of Pediatric Hematology and Oncology University Children's Hospital Münster Albert‐Schweitzer‐Str. 33 48149 Münster Germany
3. Department of Pediatrics University Hospital of North‐Norway Tromsø Norway
4. Department of Pediatric Medicine Oslo University Hospital Rikshospitalet P.O. Box 4950 Nydalen N‐0424 Oslo Norway
5. Department of Pediatric Hematology and Oncology University of Saarland Gebäude 9 66421 Homburg Germany
6. Department of Pediatric Hematology and Oncology University Mannheim Theodor‐Kutzer‐Ufer 1‐3 68167 Mannheim Germany
7. Institute of Biostatistics and Clinical Research University of Münster Schmeddingstraße 56 48149 Münster Germany
8. Institute of Neuropathology University Hospital Münster Pottkamp 2 48149 Münster Germany
9. Department of Radiooncology University of Leipzig Stephanstraße 9a 04103 Leipzig Germany
10. Children's Hospital Medical Center Technische Universität Munich, Kölner Platz 1 80804 München Germany
11. Institute of Human Genetics Christian‐Albrechts‐University Kiel & University Hospital Schleswig‐ Holstein Campus Kiel, Arnold‐Heiler‐Str. 3 24105 Kiel Germany
12. Department for Children and Adolescents Section for Pediatric Hematology/Oncology St Olav's Hospital University Hospital of Trondheim 7006 Trondheim Norway
13. Department of Pediatric Hematology and Oncology University Medical Center Hamburg‐Eppendorf Martinistraße 52 20246 Hamburg Germany
14. Department of Pediatric Oncology Hospital Infantil Virgen del Rocio AVDA Manuel Siurot S/N 41013 Sevilla Spain
15. Department of Pediatric Hematology and Oncology University Würzburg Josef‐Schneider‐Str. 2 97080 Würzburg Germany
16. Department of Pediatric Hematology and Oncology Ludwig‐Maximilian‐University Munich Lindwurmstr. 4 80337 München Germany
17. Particle Therapy Clinic at West German Proton Therapy University Hospital Essen Hufelandstr. 55 45147 Essen Germany
18. Department of Neuroradiology University Hospital Würzburg Josef‐Schneider‐Str. 11 97080 Würzburg Germany