1. Division of Oncology, Children's Hospital of Philadelphia and Department of Pediatrics; Perelman School of Medicine at the University of Pennsylvania; Philadelphia Pennsylvania
2. Division of Pediatric Hematology and Oncology; British Columbia Children's Hospital, University of British Columbia; Vancouver British Columbia Canada
3. Department of Pediatric Hematology and Oncology; University of Cologne; Cologne Germany
4. Chiba Cancer Center Research Institute; Chiba Japan
5. Children's Cancer Research Institute, St. Anna Kinderspital; Vienna Austria
6. Department of Surgery; The National Hospital; Rikshospitalet Oslo Norway
7. University of Chicago School of Medicine; Chicago Illinois
8. Institute of Cancer Research; Royal Marsden Hospital, Sutton; Surrey United Kingdom
9. Boston Children's Hospital and Dana-Farber Harvard Cancer Center, Harvard Medical School and Children's Oncology Group Statistics and Data Center; Boston Massachusetts
10. Department of Pediatrics; University of California San Francisco School of Medicine; San Francisco California