1. Clinic of Paediatric Haematology and Oncology University Medical Centre Hamburg‐Eppendorf Hamburg Germany
2. Department of Pediatric Oncology, Hematology and Clinical Immunology Medical Faculty Duesseldorf Duesseldorf Germany
3. Department of Pediatric Hematology/Oncology University Hospital Bonn Bonn Germany
4. Department of Pediatric Hematology/Oncology University Hospital Mainz Mainz Germany
5. Dr. von Hauner Children's Hospital Ludwig Maximilian University Munich Germany
6. Department of Pediatric Hematology and Oncology Helios Hospital Krefeld Germany
7. Department of Pediatric Hematology and Oncology Hospital Bielefeld Bielefeld Germany
8. Department of Pediatric Hematology and Oncology Hospital Bremen‐Mitte Bremen Germany
9. Department of Pediatric Haematology and Oncology Medical School Hannover Hannover Germany