1. Princess Máxima Center for Pediatric Oncology, 3584 CS Utrecht, The Netherlands
2. Department of Hematology/Oncology and Cell and Gene Therapy, Bambino Gesù Children Hospital, 00165 Rome, Italy
3. Clinica Pediatrica Università degli Studi di Milano Bicocca, 20900 Monza, Italy
4. Department of Stem Cell Transplantation, Hospital Infantil Universitario Nino Jesus, 28009 Madrid, Spain
5. Department of Pediatric Hematology, AP-HP, Robert Debré Hospital, 75019 Paris, France
6. Division of Pediatrics, University Medical Center Utrecht, 3584 CX Utrecht, The Netherlands
7. Department of Stem Cell Transplantation, Regenerative Medicine Center, University Medical Center, 3584 CX Utrecht, The Netherlands