1. Department of Paediatric Oncology; Children's University Hospital; University of Padova; Padova Italy
2. Department of Paediatric Haematology/Oncology; Children's University Hospital; Tübingen Germany
3. Transfusion Medicine Department; Tübingen University Hospital; University of Tübingen; Tübingen Germany
4. Dr. von Hauner Children's Hospital; Ludwig Maximilians University; Munich Germany
5. Department of Paediatric Oncology; University Children's Hospital; University of Würzburg; Würzburg Germany
6. Department of Paediatric Haematology and Oncology; University Hospital Eppendorf; Hamburg Germany
7. Department of Paediatric Oncology, Haematology and Immunology; University of Heidelberg; Heidelberg Germany
8. Clinic for Paediatric and Adolescent Medicine; University Hospital Frankfurt; Frankfurt/Main Germany
9. Filderklinik; Filderstadt-Bonlanden Germany