1. Department of Orthopedic Surgery Johns Hopkins University School of Medicine Baltimore Maryland
2. Department of Orthopedic Oncology Helios Klinikum Berlin‐Buch Sarcoma Center Berlin‐Brandenburg Berlin Germany
3. Division Pediatric Surgery East Carolina University Greenville North Carolina
4. Pediatric Surgery, Pediatric Solid Tumor Unit Princess Máxima Center for Pediatric Oncology Utrecht the Netherlands
5. Sarcoma Department, Adolescent and Young Adult Program H. Lee Moffitt Cancer Center and Research Institute Tampa Florida
6. Department of Pediatric Surgery Marciniak Hospital, Wroclaw Poland and Department of Pediatric Traumatology and Emergency Medicine Medical University Wroclaw Poland
7. Pediatric Surgery Division, Department of Women's and Children's Health University of Padua Padua Italy
8. Department of Radiation Oncology Stanford University Medical Center Stanford California
9. Division of Hematology/Oncology Seattle Children's Hospital Fred Hutchinson Cancer Research Center University of Washington Seattle Washington
10. Klinikum Stuttgart Zentrum für Kinder Jugendund Frauenmedizin Olga Hospital, Pediatrics 5 (Pediatric Oncology Hematology and Immunology) Stuttgart Germany
11. Hematology and Oncology Division Department of Women's and Children's Health Padova University Hospital Padova Italy
12. Department of Pediatric Surgery University Hospitals Bristol NHS Foundation Trust Bristol United Kingdom