1. Department of Radiation Oncology Diablo Valley Oncology and Hematology Pleasant Hill California
2. Department of Radiation Oncology Ghent University Hospital Gent Belgium
3. Department of Radiation Oncology St Jude Children's Research Hospital Memphis Tennessee
4. Department of Radiation Oncology Miami Cancer Institute Baptist Health South Florida Florida
5. Department of Childhood and Adolescent Cancer Gustave Roussy Cancer Campus Villejuif‐Grand Paris France
6. Department of Pediatric Hematology and Oncology University Children's Hospital Cologne Germany
7. Department of Pediatrics Division of Oncology Children's Hospital of Philadelphia and the Perelman School of Medicine University of Pennsylvania Philadelphia Pennsylvania
8. Department of Radiation Oncology University of Pennsylvania and the Children's Hospital of Philadelphia Philadelphia Pennsylvania