1. Hospital for Sick Children and University of Toronto; Toronto Canada
2. Children's Hospital of Philadelphia and University of Pennsylvania School of Medicine; Philadelphia Pennsylvania
3. University of Chicago; Chicago Illinois
4. Hospital Universitario Niño Jesus; Madrid Spain
5. Seattle Children's Hospital and University of Washington School of Medicine; Seattle Washington
6. Institute of Cancer Research and Royal Marsden National Health Service (NHS) Foundation Trust; Sutton Surrey UK
7. Institut Curie; Paris France
8. Gustave Roussy; Villejuif France
9. Dana-Farber/Boston Children's Cancer and Blood Disorders Center; Harvard Medical School; Boston Massachusetts