1. Department of Paediatrics; Stem Cell Transplantation Unit; Leiden University Medical Centre; Leiden The Netherlands
2. Department of Paediatric Haematology/Oncology; Fondazione IRCCS Policlinico S. Matteo; Pavia Italy
3. Department of Paediatric Haematology/Oncology; University of Pavia; IRCCS Ospedale Pediatrico Bambino Gesù; Rome Italy
4. Department of Immunohaematology and Blood Transfusion; Leiden University Medical Centre; Leiden The Netherlands
5. The Centre for Clinical Transfusion Research; Sanquin Blood supply; Leiden The Netherlands
6. Department of Laboratory Medicine; Karolinska Institutet; Haematology Centre; Karolinska University Hospital; Stockholm Sweden
7. Centro Cellule Staminali; Istituto G. Gaslini; IRCCS; Genova Italy
8. Department of Stem Cell Transplantation; Hospital for Sick Children/University of Toronto; Toronto ON Canada