1. Department of Pediatric Hematology and Oncology, St. Anna Children's Hospital, Medical University of Vienna, Vienna, Austria;
2. Division of Hematology and Oncology, Department of Pediatrics, Hospital for Sick Children, Toronto, ON, Canada;
3. Division of Pediatric Hematology and Oncology, Department of Pediatrics, Weill Cornell Medical College, New York, NY;
4. Northern Institute for Cancer Research, Newcastle University, Newcastle, United Kingdom;
5. Department of Pediatric Hematology and Oncology, University of Münster, Münster, Germany;
6. Pediatric Hematology-Oncology Research Laboratory and Pediatric Hematology-Oncology Unit, Division of Pediatrics, Department Woman-Mother-Child, Lausanne University Hospital, Lausanne, Switzerland;
7. Department of Pediatrics and Adolescent Medicine, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Queen Mary Hospital, Pokfulam, Hong Kong;
8. Center for Cancer and Blood Disorders, Children’s National Medical Center, The George Washington University, Washington, DC;
9. Belarusian Research Center for Pediatric Oncology, Hematology and Immunology, Minsk, Belarus;
10. Center for Cancer and Blood Disorders, Phoenix Children’s Hospital, Phoenix, AZ;
11. Division of Pediatrics, Hematology, and Oncology, University Medical Center Ljubljana, Ljubljana, Slovenia;
12. Department of Pediatric Hematology and Oncology, Charles University and University Hospital Motol, Prague, Czech Republic;
13. Telethon Kids Cancer Centre, Telethon Kids Institute, University of Western Australia, Perth, WA, Australia;
14. Department of Pediatric Hematology and Oncology, University Children's Hospital, School of Medicine, University of Belgrade, Belgrade, Serbia;
15. Princess Maxima Center for Pediatric Oncology, Utrecht, The Netherlands;
16. Department of Pediatric Hematology and Oncology, Federal Center for Pediatric Hematology, Oncology, and Immunology, Moscow, Russia;
17. Children’s Cancer Center, National Center for Child Health and Development, Tokyo, Japan;
18. Department of Pediatric Hematology and Oncology, University of Padova, Padova, Italy;
19. Department of Oncology, “P. & A. Kyriakou” Children's Hospital, Athens, Greece;
20. Department of Pediatric and Adolescent Oncology, Gustave-Roussy Cancer Center, Paris-Sacaly University, Villejuif, France;
21. Department of Pediatric Oncology and Hematology, Yerevan State Medical University, and Pediatric Cancer and Blood Disorders Center of Armenia, Yerevan, Armenia;
22. Department of Pediatric Hematology and Oncology, University Hospital Leuven, Leuven, Belgium;
23. Department of Pediatric Hematology and Oncology, University Hospital of Valencia, Valencia, Spain;
24. Department of Pediatric Hematology and Oncology, University Hospital Hamburg-Eppendorf, Hamburg, Germany; and
25. Bone Marrow Transplantation and Pediatric Hematology and Oncology, Wroclaw Medical University, Wroclaw, Poland