1. Institute for Oncology and Radiology of Serbia, Belgrade, Serbia.
2. Department of Hematology, Lyon-Sud Hospital, Hospices Civils de Lyon, Lyon, France.
3. The European Society for Paediatric Oncology, Brussels, Belgium.
4. The Christie Hospital, Manchester, United Kingdom.
5. Cancer Centre, University Hospital Ghent, Ghent, Belgium.
6. Children's Cancer and Leukaemia Group, Leicester, United Kingdom.
7. CCI Europe, Vienna, Austria.
8. University Prof. Dr. Assen Zlatarov, Burgas, Bulgaria.
9. Youth Cancer Europe, Cluj-Napoca, Romania.
10. Medical University of Vienna, Vienna, Austria.
11. KickCancer Foundation, Brussels, Belgium.
12. Pediatric Oncology Unit, Fondazione IRCCS Istituto Nazionale dei Tumori, Milan, Italy.
13. Leeds Institute of Medical Research, School of Medicine, University of Leeds, Leeds, United Kingdom.