1. Unit of Clinical and Experimental Haematology, Istituto Giannina Gaslini, Genova, Italy;
2. Centro Interdipartimentale di Biostatistica e Bioinformatica, Università di Roma Tor Vergata, Rome, Italy;
3. Department of Medical Statistics and Bioinformatics, Leiden University Medical Centre, Leiden, The Netherlands;
4. Molecular Immunology Unit, University College London, London, United Kingdom;
5. Haematology and Oncology Department, Great Ormond Street Hospital Children’s Charity, London, United Kingdom;
6. Pediatric Hematology Oncology, Hospital Trousseau, Paris, France;
7. Department of Pediatric Hematology/Oncology, King Faisal Specialist Hospital and Research Centre, Riyadh, Saudi Arabia;
8. Stem Cell Transplantation Unit, St. Anna Children’s Hospital, Vienna, Austria;
9. Bone Marrow Transplantation Unit, Istituto Giannina Gaslini, Genova, Italy;
10. Department of Pediatric Hematology, Akdeniz University Medical School, Antalya, Turkey;
11. Hospital Necker Hematology and Immunology Unit, Hospital Necker, Paris, France;
12. Pediatric Blood and Bone Marrow Transplantation Program, University Medical Center Utrecht, Utrecht, The Netherlands;
13. Pediatric Hematology, Oncology and Bone Marrow Transplantation, Istanbul University, Istanbul, Turkey;
14. Department of Pediatric Hematology, Our Lady’s Children Hospital, Dublin, Ireland;
15. Bone Marrow Transplant Unit, Great Ormond Street Hospital for Children, London, United Kingdom;
16. Department of Hematology, Karolinska University Hospital, Stockholm, Sweden;
17. Service d'Hematologie - Transplantation, Centre Hospitalier Universitaire Saint - Louis - Assistance Publique - Hôpitaux de Paris, Paris, France;
18. Servicio de Hematologia y Oncologia Pediétrica, Hospital Vall d'Hebron, Barcelona, Spain;
19. Department of Bone Marrow Transplantation, Hadassah University Hospital, Jerusalem, Israel;
20. Department of Hematology, Hannover Medical School, Hannover, Germany;
21. Hematology and Transplantology, Saint Petersburg State Medical Pavlov University, Ratsa Gorbacheva Memorial Children’s Institute, St. Petersburg, Russia;
22. Department of Paediatric Haematology Bone Marrow Unit, Royal Manchester Children’s Hospital Manchester, United Kingdom;
23. Department and Clinic of Pediatric Oncology, Hematology and Bone Marrow Transplantation, Wroclaw Medical University, Poland; and
24. Department of Hematological Medicine, King’s College Hospital/King’s College London, London, United Kingdom