1. Department of Pediatric Oncology, Dana Farber/Boston Children’s Cancer and Blood Disorders Center , Boston, Massachusetts , USA
2. Department of Epidemiology and Biostatistics, Memorial Sloan Kettering Cancer Center , New York, New York , USA
3. Department of Pathology, Boston Children’s Hospital , Boston, Massachusetts , USA
4. Department of Radiology, Boston Children’s Hospital , Boston, Massachusetts , USA
5. Department of Oncologic Pathology, Dana-Farber Cancer Institute , Boston, Massachusetts , USA
6. Department of Pediatrics, SUNY Downstate Medical Center , Brooklyn, New York , USA
7. Pediatric Neuro-Oncology Service, Department of Pediatrics, Memorial Sloan Kettering Cancer Center , New York, New York , USA
8. Department of Pathology, Memorial Sloan Kettering Cancer Center , New York, New York , USA
9. Division of Hematology-Oncology, Cancer and Blood Disease Institute at Children’s Hospital Los Angeles and Keck School of Medicine at University of Southern California , Los Angeles, California , USA
10. Department of Pediatrics, Kaiser Permanente Southern California , Los Angeles, California , USA
11. Department of Pathology, Washington University School of Medicine , St. Louis, Missouri , USA
12. Department of Pediatrics, University of Alabama at Birmingham , Birmingham, Alabama , USA
13. Department of Pediatrics, Cohen Children’s Medical Center , New Hyde Park, New York , USA
14. Department of Pediatrics, Norton Children’s Hospital/Affiliate of University of Louisville School of Medicine , Louisville, Kentucky , USA
15. Children’s Healthcare of Atlanta, Emory University School of Medicine , Atlanta, Georgia , USA