1. Department of Pediatrics University of Texas Southwestern Medical Center Dallas Texas USA
2. Children's Oncology Group Statistics and Data Center Department of Biostatistics University of Florida Gainesville Florida USA
3. Children's Oncology Group Statistics and Data Center Monrovia California USA
4. Department of Pediatrics Hospital for Sick Children Toronto Ontario Canada
5. Department of Pediatric Oncology Dana‐Farber Cancer Institute Boston Massachusetts USA
6. Division of Pediatric Hematology/Oncology Boston Children's Hospital Boston Massachusetts USA
7. Harvard Medical School Boston Massachusetts USA
8. Department of Pediatrics Children's Hospital of Philadelphia and Perelman School of Medicine University of Pennsylvania Philadelphia Pennsylvania USA
9. Division of Population Sciences Dana‐Farber Cancer Institute Boston Massachusetts USA