1. Department of Paediatric Oncology, Haematology and Clinical Immunology; Medical Faculty; University Children's Hospital; Heinrich Heine University; Duesseldorf Germany
2. Department for Children and Adolescents; Division for Stem Cell Transplantation and Immunology; University Hospital Frankfurt; Goethe University; Frankfurt Germany
3. Paediatric Haematology Department; Robert Debré Hospital and Paris Diderot University; Paris France
4. University of Medical Sciences; Poznan Poland
5. Ezer Mizion Bone Marrow Donor Registry; Petach Tikva Israel
6. Bone Marrow Transplant Unit; Schneider Children's Medical Centre of Israel; Petach Tikva Israel
7. Department for Children and Adolescents; Rigahospitalet; Copenhagen University Hospital; Copenhagen Denmark
8. Department of Paediatric Haematology and Oncology; Teaching Hospital Motol; Prague Czech Republic
9. Division of Stem Cell Transplantation; University Children's Hospital Zürich; Zürich Switzerland
10. University Hospital Tuebingen; Tuebingen Germany
11. Department of Paediatric Haematology and Oncology; Haematopoietic Stem Cell Transplantation Unit; Comenius University Children's Hospital Bratislava; Bratislava Slovakia
12. Clinica Pediatrica Università degli Studi di Milano Bicocca; Ospedale San Gerardo; Monza Italy
13. Department of Paediatrics and Adolescent Medicine; Division of Paediatric Haematology and Oncology; Medical Centre; Faculty of Medicine; University of Freiburg; Freiburg Germany
14. Department of Paediatrics; Klinikum rechts der Isar; Technische Universität München; Munich Germany
15. Comprehensive Cancer Centre Munich (CCCM); Munich Germany
16. Department of Paediatrics; University Medical Centre Schleswig-Holstein; Kiel Germany
17. Department of Paediatric Oncology/Haematology; Charité Universitätsmedizin Berlin; Charité Campus Virchow; Berlin Germany
18. St. Anna Children's Hospital; Vienna Austria