1. Hematopoietic Stem Cell Transplantation UnitHematology‐OncologyIstituto G Gaslini Genova Italy
2. Dipartimento di Onco‐Ematologia Pediatrica IRCSS Ospedale Pediatrico Bambino Gesù Rome Italy
3. Division of Stem Cell Transplantation and Regenerative Medicine Department of Pediatrics School of Medicine Stanford University Stanford California
4. European Society for Blood and Marrow Transplantation Pediatric Disease Working Party Paris France
5. Department for Children and Adolescents Rigshospitalet Copenhagen University Hospital Copenhagen Denmark
6. Department of Pediatrics University Medical Center Ulm Germany
7. Institute of Cellular Medicine Pediatric Immunology Department Newcastle University Great North Children's Hospital Newcastle‐upon‐Tyne UK
8. Pediatric Hematology and Oncology University Hospital Münster Muenster Germany
9. Pediatric Hematopoietic Transplant Unit Sant Pau Hospital Barcelona Spain
10. Department of Pediatric Oncology and Hematology Hospital Universitario Vall d'Hebron Barcelona Spain
11. Department of Pediatrics Stem Cell Transplantation Program Leiden University Medical Center Leiden The Netherlands
12. Department of Pediatrics Jena University Hospital Jena Germany
13. St Anna Children′s Hospital Medical University of Vienna Vienna Austria
14. Department Pediatric Hematology, Oncology, Hemostaseology Universitätsklinikum Leipzig Leipzig Germany
15. Clinic of Pediatric Hemato‐Oncology Department of Women's and Children's Health University Hospital of Padova Padova Italy
16. Hematology, Oncology and Stem Cell Transplantation Department of Pediatrics Hôpital Hautepierre Strasbourg France
17. Service of Pediatric Hematology‐Oncology Hôpital Armand Trousseau Paris France
18. Unidad de Hematología y Oncología Pediátrica Hospital Universitario La Paz Madrid Spain
19. Instute Portugues Oncologia Lisboa Lisboa Portugal
20. University Hospital Eppendorf Hamburg Germany
21. University Hospital Motol Prague Czech Republic
22. Pediatric Blood and Marrow Transplantation Program Laboratory for Translational Immunology Tumor‐immunology University Medical Center Utrecht The Netherlands
23. Stem Cell Transplant and Cellular Therapies PediatricsMemorial Sloan Kettering Cancer Center New York New York
24. Department for Children and AdolescentsDivision for Stem Cell Transplantation and ImmunologyUniversity Hospital Frankfurt Frankfurt am Main Germany