1. Department of Women’s and Children’s Health, University of Padova, 35128 Padua, Italy
2. Pediatric Hematology-Oncology Division, University Hospital of Padova, 35128 Padova, Italy
3. Children and Young People’s Unit, Royal Marsden Hospital, Institute of Cancer Research, Sutton SM2 5NG, UK
4. Department of Pediatric Histopathology, Manchester University Foundation Trust, Manchester M13 9WL, UK
5. Pathology Unit, Department of Laboratories, Bambino Gesù Children’s Hospital, IRCCS, 00165 Rome, Italy
6. Department of Pediatric and Adolescent Oncology, INSERM U1015, Gustave Roussy, Université Paris-Saclay, 94800 Villejuif, France
7. Department of Pediatric Oncology, Children’s Hospital for Wales, Cardiff CF14 4XW, UK
8. Department of Radiation Oncology, University Medical Center Utrecht, 3584 CX Utrecht, The Netherlands
9. Princess Máxima Center for Pediatric Oncology, 3584 CS Utrecht, The Netherlands
10. Division of Imaging and Oncology, University Medical Center Utrecht, Utrecht University, 3584 CX Utrecht, The Netherlands
11. Sarcoma Molecular Pathology Team, Divisions of Molecular Pathology and Cancer Therapeutics, The Institute of Cancer Research, London SM2 5NG, UK