1. Klinikum Stuttgart, OlgahospitalStuttgart Cancer CenterZentrum für Kinder‐Jugend‐ und FrauenmedizinPediatrics 5 (Oncology, Hematology, Immunology) Stuttgart Germany
2. Department of Pediatric Hematology and OncologyChildren's Hospital Tuebingen Germany
3. Section of Pediatric Pathology, Department of Pathology Kiel Pediatric Tumor Registry Kiel Germany
4. Division of Pediatric Hematology and OncologyDr. von Hauner Children's HospitalLudwig‐Maximilians University of Munich Munich Germany
5. Department of PediatricsHematologyOncology and EndocrinologyMedical University of Gdansk Gdansk Poland
6. Department of Pediatric SurgeryUniversity Children's Hospital Marburg Marburg Germany
7. Klinikum Stuttgart, OlgahospitalStuttgart Cancer CenterZentrum für Kinder‐Jugend‐ und FrauenmedizinOlgahospitalInstitute of Radiology Stuttgart Germany
8. Klinikum StuttgartInstitute of Radiotherapy Stuttgart Germany
9. Department of Pediatric Hematology and OncologyUniversity of Muenster Muenster Germany
10. Department of Pediatric OncologyUniversity of Zurich Zurich Switzerland
11. Department of Women's and Children`s HealthUniversity of UppsalaChildren's University Hospital Uppsala Sweden
12. Department of Pediatric Surgery and UrologyUniversity Children's Hospital Tuebingen Germany
13. Department of Pediatrics and Adolescent MedicineDivision of Pediatric Hematology and OncologyFaculty of MedicineUniversity of Freiburg Germany
14. Universitätsklinik für KinderheilkundeHämatologie und OnkologieInselspitalUniversitätsspital Bern Switzerland
15. Department for Children and AdolescentsUniversity of Frankfurt Frankfurt am Main Germany