1. Klinikum Stuttgart – Olgahospital, Stuttgart Cancer CenterZentrum für Kinder‐, Jugend‐ und Frauenmedizin, Pediatrics 5 (Oncology, Hematology, Immunology) Stuttgart Germany
2. Children's HospitalDepartment of Pediatric Hematology and Oncology Tuebingen Germany
3. Kiel Pediatric Tumor RegistrySection of Pediatric Pathology, Department of Pathology Kiel Germany
4. University Children's Hospital MarburgDepartment of Pediatric Surgery Marburg Germany
5. Klinikum Stuttgart – Olgahospital, Stuttgart Cancer CenterZentrum für Kinder‐, Jugend‐ und Frauenmedizin, Olgahospital, Institute of Radiology Stuttgart Germany
6. Klinikum StuttgartInstitute of Radiotherapy Stuttgart Germany
7. University of MuensterDepartment of Pediatric Hematology and Oncology Muenster Germany
8. St. Anna KinderspitalPediatric Oncology Wien Austria
9. University Children's HospitalDepartment of Pediatric Surgery and Urology Tuebingen Germany
10. University of FrankfurtHospital for Children and Adolescents Frankfurt Germany