1. Service d’Hématologie Greffe and
2. Department de Biostatistique Médicale, Assistance Publique des Hôpitaux de Paris–Hôpital Saint Louis, Paris, France;
3. Service d’Hématologie Pédiatrique, AP-HP-Hôpital Robert Debré Paris, France;
4. Oncology Centre, King Faisal Specialist Hospital and Research Centre, Riyadh, Saudi Arabia;
5. Pediatric Stem Cell Transplantation, Leiden University Medical Center, Leiden, The Netherlands;
6. Pediatric Hematology, Ospedale Gaslini, Genova, Italy;
7. Department of Hematology, Leiden University Medical Center, Leiden, The Netherlands;
8. Hospital Vall d’Hebron, Barcelona, Spain;
9. Institut d’Hematologie et d' Oncologie Pediatrique, Lyon, France;
10. Institut National pour la Santé et la Recherche Médicale Unité 944 and Hematology Laboratory, Saint-Louis Hospital and University Paris-Diderot, Paris, France;
11. Department of Hematology, Ospedale San Martino, Genova, Italy;
12. Haematological Medicine, King's College Hospital/King's College London, London, United Kingdom;
13. Stem Cell Transplantation Unit, St. Anna Children's Hospital and European Group for Blood and Marrow Transplantation-Pediatric Diseases Working Party, Vienna, Austria;
14. Université Paris-Diderot, Paris, France U728, Paris; and
15. Pediatric Hematology, G. Gaslini Institute, Genova, Italy