1. Paediatric Haematology and Oncology; University Medical Centre Hamburg Eppendorf; Hamburg Germany
2. Department of Oncology; St. Jude Children's Research Hospital; Memphis Tennessee USA
3. Paediatric Haematology and Oncology; University Hospital Giessen; Giessen Germany
4. Paediatric Haematology and Oncology; University Hospital Dresden; Dresden Germany
5. Paediatric Haematology and Oncology; University Hospital Halle; Halle Germany
6. Paediatric Haematology and Oncology; Clinical Centre Schwabing and München Rechts der Isar; Technical University Munich; Munich Germany
7. Centre of Chronic Immunodeficiency; University of Freiburg; Freiburg Germany
8. Paediatric Haematology and Oncology; University Hospital Jena; Jena Germany
9. Paediatric Haematology and Oncology; Elisabeth-Hospital Oldenburg; Oldenburg Germany
10. Gemeinschaftskrankenhaus Herdecke; University of Witten/Herdecke; Herdecke Germany
11. Paediatric Haematology and Oncology; Rudolfstiftung Hospital Vienna; Vienna Austria
12. Paediatric Oncology and Haematology; Olgahospital; Klinikum Stuttgart; Stuttgart Germany
13. Dr. von Hauner Children's Hospital; Ludwig-Maximilians-University Munich; Munich Germany
14. Paediatric Haematology and Oncology; University Hospital Kiel; Kiel Germany