1. 1Goethe University, University Hospital, Department of Pediatrics, Division for Stem Cell Transplantation, Immunology and Intensive Care Medicine, Frankfurt, Germany
2. 2St. Anna Children's Cancer Research Institute, Vienna, Austria
3. 3Pediatric Hematology and Immunology Department, Robert Debré Hospital, Groupe Hospitalo-Universitaire Assistance Publique Hôpitaux de Paris (GHU AP-HP) Nord, Université Paris Cité, Paris, France
4. 4Università degli Studi di Milano-Fondazione, FONDAZIONE MONZA E BRIANZA PER IL BAMBINO E LA SUA MAMMA (MBBM), Department for Pediatric Hematology and Oncology, Monza, Italy
5. 5CANSEARCH Research Platform for Pediatric Oncology and Hematology, Faculty of Medicine, Department of Pediatrics, Gynecology and Obstetrics, University of Geneva, Switzerland
6. 6Division of Pediatric Oncology and Hematology, Department of Women, Child and Adolescent, University Geneva Hospitals, Geneva, Switzerland
7. 7Department of Pediatric Hematology and Oncology, Oslo University Hospital, Oslo, Norway
8. 8Department of Hematology/Oncology/Immunology, Gene Therapy, and Stem Cell Transplantation, University Children's Hospital Zürich, Eleonore Foundation & Children’s Research Center, Zürich, Switzerland
9. 9Copenhagen University Hospital Rigshospitalet, Department for Pediatric Hematology and Oncology, Copenhagen, Denmark
10. 10Pediatric Hematology and Stem Cell Transplantation Department, Central Hospital of Southern Pest, National Institute of Hematology and Infectious Diseases, Budapest, Hungary
11. 11St. Anna Children's Hospital, University Vienna, Vienna, Austria
12. 12Department of Paediatric Oncology, University Hospital Leuven, Leuven, Belgium
13. 13Hospital de Pediatría “Prof. Dr. Juan P. Garrahan,” Buenos Aires, Buenos Aires, Argentina
14. 14Department of Pediatric Hematology and Oncology, Motol University Hospital, Prague, Czech Republic
15. 15Schneider Children's Medical Center of Israel and Sackler Faculty of Medicine, Tel Aviv University, Petah Tikva, Israel
16. 16Division of Pediatric Oncology and Cellular Therapy, Alberta Children's Hospital, Calgary, Alberta, Canada
17. 17Department of Pediatric Oncology, Hematology and Transplantology, Poznań University of Medical Sciences, Poznań, Poland
18. 18Medical Park Antalya Hospital, Antalya, Turkey
19. 19Department of Pediatric Hematology and Oncology, Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS) Ospedale Pediatrico Bambino Gesù, Catholic University of the Sacred Heart, Rome, Italy