1. Division of Pediatric Hematology and Oncology Department of Pediatrics Universities of Medical University Hannover Hannover Germany
2. IRCCS “Bambino Gesù” Children’s Hospital Rome Italy
3. Institution of Clinical Sciences Sahlgrenska University Hospital Gothenburg Sweden
4. Cansearch Research Laboratory Geneva University Hospital Geneva University Geneva Switzerland
5. Clinica Pediatrica Università degli Studi di Milano Bicocca Fondazione MBBM/Ospedale San Gerardo Monza Italy
6. University Children’s Hospital Zurich CHE Zurich Switzerland
7. Princess Maxima Centre for Pediatric Oncology Childrens University Hospital Utrecht Utrecht Netherlands
8. Aarhus University Hospital Arhus Sweden
9. Willem Alexander Children’s Hospital Leiden University Medical Centre Leiden Netherlands
10. Queensland Children’s Hospital and The University of Queensland Brisbane QLD Australia
11. Australasian Bone Marrow Transplant Recipient Registry Darlinghurst NSW Australia
12. University of Medical Sciences Poznan Poland
13. St Anna Childrens Hospital Vienna Austria
14. University Hospital Motol Charles University Prague Czech Republic
15. University of Duisburg‐Essen Essen Germany
16. Schneider Children's Medical Center of Israel Petach Tikva Israel
17. University Medical Center Utrecht Utrecht Netherlands
18. Ghent University Hospital Ghent Belgium
19. Sapienza University of Rome Rome Italy