1. Department of Nuclear Medicine University of Leipzig Leipzig Germany
2. Department of Pediatric Hematology and Oncology Justus‐Liebig University Gießen Germany
3. Medical Faculty of the Martin‐Luther‐University Halle (Saale) Germany
4. Department of Medical Oncology and Radiotherapy Oslo University Hospital Oslo Norway
5. Department of Radiology Medical Faculty of the Martin‐Luther‐University Halle (Saale) Germany
6. Department of Radiation Oncology Medical Faculty of the Martin‐Luther‐University Halle (Saale) Germany
7. Department of Ear, Nose and Throat Medicine Hospital Martha‐Maria Halle Halle (Saale) Germany
8. Institute for Medical Informatics, Statistics and Epidemiology (IMISE) University of Leipzig Leipzig Germany
9. Hôpital Armand‐Trousseau Sorbonne Universitè Paris France
10. Department of Paediatric Oncology, Royal Hospital for Sick Children University of Edinburgh Edinburgh UK
11. Karolinska University Hospital Astrid Lindgrens Childrens Hospital Stockholm Sweden
12. Pediatric Onco‐Hematology Unit Hospital Universitario Virgen Macarena Sevilla Spain
13. Department of Pediatric Hematology and Oncology University Hospital Motol and, Second Medical Faculty of Charles University Prague Czech Republic
14. Institute of Pediatrics Jagiellonian University Medical College Krakow Poland
15. Department of Radiology and Nuclear Medicine Oslo University Hospital Oslo Norway
16. Department of Nuclear Medicine Justus‐Liebig University Giessen Giessen Germany
17. Department of Radiology Justus‐Liebig University Giessen Giessen Germany
18. Department of Pediatric Hematology and Oncology, St. Anna Children's Hospital Medical University of Vienna Vienna Austria
19. Wiener Privatklinik Radiology Centre Vienna Austria
20. Division of Pediatrics, Department of Woman‐, Mother‐Child Pediatric Hematology‐Oncology Unit, University Hospital of Lausanne Lausanne Switzerland
21. Department of Pediatric Hematology and Oncology Our Lady's Children's Hospital Dublin Ireland
22. Department of Pediatric Hematology and Oncology University Children's Hospital Bratislava Slovakia
23. Department of Pediatric Hematology and Oncology University Hospitals Leuven Leuven Belgium
24. Erasmus MC–Sophia Children's Hospital Rotterdam The Netherlands
25. Princess Màxima Center for Pediatric Oncology Utrecht The Netherlands
26. Department of Radiation Oncology University Hospital Vienna Vienna Austria
27. Service d'Hématologie Pédiatrique Hôpital Robert‐Debré Paris France
28. Department of Pediatric Hematology and Oncology University College London Hospitals London UK