1. Children’s Cancer Research Institute and St. Anna Children’s Hospital, Vienna, Austria;
2. Department of Hematology-Oncology, University Children’s Hospital, Florence, Italy;
3. Hospital Universitario Cruces, Bilbao, Spain;
4. Hospital Nacional de Pediatria J. Garrahan, Buenos Aires, Argentina;
5. Hospital Trousseau, Paris, France;
6. Childhood Cancer Research Unit, Karolinska Institutet, Karolinska University Hospital, Stockholm, Sweden;
7. Department of Hematology and Oncology, University Medical Center, Hamburg, Germany;
8. Texas Children’s Cancer and Hematology Centers, Houston, TX;
9. Hospital for Sick Children, Division of Hematology/Oncology, Toronto, Ontario, Canada;
10. Newcastle University, Newcastle, United Kingdom; and
11. Children’s Research Institute, Children’s National Medical Center, Washington DC