1. Clinical and Experimental Haematology Unit; Giannina Gaslini Children's Hospital; Genova Italy
2. Department of Haematology & Bone Marrow Transplantation; Great Ormond Street Hospital for Children NHS Foundation Trust; London UK
3. Paediatric Haematology and Oncology; University of Padova; Padova Italy
4. Blood and Marrow Transplant Unit; Royal Manchester Children's Hospital; Manchester UK
5. Department of Paediatric Haematology & Oncology; Royal Hospital for Sick Children; Glasgow UK
6. Department of Paediatric Haematology; The Children's Hospital; Sheffield UK
7. BMT Unit; Royal Hospital for Children; Bristol UK
8. University College Hospital; London UK
9. Division of Paediatrics; Imperial College Healthcare NHS Trust; London UK
10. Birmingham Children's Hospital; Birmingham UK
11. Department of Paediatric and Adolescent Haematology/Oncology and BMT; Great North Children's Hospital & Northern Institute for Cancer Research; Newcastle upon Tyne UK
12. Haematology and Oncology Department; IRCCS A.O.U. San Martino Hospital; IST; Genoa Italy
13. Haematology; Federico II; Naples Italy
14. Hôpital Saint-Louis; Paris France
15. Stem Cell Transplant Team; Division of Haematology; University Hospital Basel; Basel Switzerland
16. Haematology; University Hospital of Basel; Basel Switzerland
17. Institute for Clinical Transfusion Medicine and Immunogenetics Ulm; German Red Cross Transfusion Service Baden-Württemberg-Hessen und University Hospital Ulm; Ulm Germany
18. Division for Stem Cell Transplantation and Immunology; Hospital for Children and Adolescents; University Hospital Frankfurt; Goethe University; Frankfurt am Main Germany
19. EBMT Data Office; University Medical Centre; Leiden The Netherlands
20. Adult Haematology/HSCT Oncology Centre; King Faisal Specialist Hospital and Research Centre; Riyadh Saudi Arabia
21. Department of Haematological Medicine; King's College Hospital NHS Foundation Trust; London UK