1. Division of Pediatric Hematology-Oncology, Department of Pediatrics and Adolescent Medicine, University Medical Center, Freiburg, Germany
2. Division of Pediatric Hematology-Oncology, Department of Pediatrics and Adolescent Medicine, University Medical Center, Freiburg, Germany German Cancer Consortium (DKTK), Heidelberg, Germany
3. St. Anna Children's Hospital and Children's Cancer Research Institute, Department of Pediatrics, Medical University of Vienna, Vienna, Austria
4. Department of Pediatrics, Aarhus University Hospital, Skejby, Denmark
5. Erasmus Medical Centre, Rotterdam, The Netherlands
6. Department of Pediatric Hematology-Oncology, Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS) Ospedale Bambino Gesù, Rome, Italy University of Pavia, Pavia, Italy
7. Pediatric Oncology and Hematology, University of Bologna, Bologna, Italy
8. Department of Hematology and Oncology, University Children's Hospital, Zurich, Switzerland
9. Olgahospital, Pediatrics 5 (Oncology, Hematology, Immunology, Rheumatology, Gastroenterology, and General Pediatrics), Klinikum Stuttgart, Stuttgart, Germany
10. Department of Hematology and Oncology, Pediatric Hospital Prof Dr Juan P. Garrahan, Buenos Aires, Argentina
11. Department of Pediatric Oncology, Hematology and Immunology, University of Heidelberg, Heidelberg, Germany
12. Department of Pediatric Hematology, Dr Abdurrahman Yurtaslan Ankara Oncology Training and Research Hospital of the Ministry of Health, Ankara, Turkey
13. Division of Pediatric Hematology and Oncology, University Children's Hospital, Dresden, Germany
14. University Children’s Hospital, Ulm, Germany