1. Department of Paediatric Oncology, Haematology and Clinical Immunology; University Children's Hospital, Medical Faculty, Heinrich Heine University; Duesseldorf Germany
2. Department of Paediatrics; University Hospital Schleswig-Holstein; Kiel Germany
3. Clinic of Paediatric Haematology and Oncology; Medical Centre; Hamburg-Eppendorf Germany
4. Department of General Paediatrics, Oncology/Haematology; University Children's Hospital; Tuebingen Germany
5. Department of Paediatric Oncology/Haematology; Erasmus MC-Sophia Children's Hospital; Rotterdam the Netherlands
6. Department of Paediatrics and Adolescent Medicine; University Medical Centre; Ulm Germany
7. Department of Paediatrics; University Hospital; Frankfurt Germany
8. Department of Paediatric Oncology, Haematology and Immunology; Klinikum Stuttgart; Olgahospital Germany
9. Paediatric Haematology and Oncology; University Children′s Hospital Muenster; Muenster Germany
10. Department of General Paediatrics, Haematology/Oncology; Klinikum Oldenburg Germany
11. Department of Paediatric Oncology, Haematology; BMT, Charité University Medicine; Berlin Germany