1. Division of Pediatric Hematology/Oncology, Roger Maris Cancer Center Sanford Health Fargo North Dakota USA
2. Department of Pediatrics University of Chicago Chicago Illinois USA
3. Division of Hematology/Oncology, Department of Pediatrics, Seattle Children's Hospital University of Washington School of Medicine Seattle Washington USA
4. Department of Paediatric and Adolescent Oncology Gustave‐Roussy Villejuif France
5. Division of Pediatric Surgery University of Kentucky Lexington Kentucky USA
6. Klinikum der Landeshauptstadt Stuttgart, Olgahospital, Zentrum für Kinder‐, Jugend ‐und Frauenmedizin, Pediatrie 5 (Pädiatrische Onkologie, Hämatologie, Immunologie) Stuttgart Cancer Center Stuttgart Germany
7. Medical Faculty University of Tübingen Tübingen Germany
8. Hematology Oncology Division, Department of Women's and Children's Health University Hospital of Padova Padua Italy
9. Clinical Research Unit Istituto Oncologico Veneto IOV IRCCS Padua Italy
10. Department Pediatric Hematology/Oncology, Children's University Hospital Eberhard Karls University of Tuebingen Tübingen Germany
11. Princess Máxima Center for Pediatric Oncology Utrecht The Netherlands
12. Department of Radiation Oncology Memorial Sloan Kettering Cancer Center New York New York USA
13. Department of Biostatistics, Children's Oncology Group Statistics and Data Center University of Florida Gainesville Florida USA