1. 1Children's Hospital of Atlanta, Emory University and the Aflac Cancer Center, Atlanta, Georgia.
2. 2The Children's Hospital of Philadelphia and the University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania.
3. 3Center for Neuroscience and Behavioral Medicine and Brain Tumor Institute, Children's National Hospital, and The George Washington University School of Medicine, Washington, DC.
4. 4Princess Máxima Center for Pediatric Oncology, Utrecht, the Netherlands.
5. 5Pediatric Medicines Office, Scientific Evidence Generation Department, Human Medicines Division, European Medicines Agency (EMA), Amsterdam, the Netherlands.
6. 6Center for Drug Evaluation and Research, Office of New Drugs, U.S. Food and Drug Administration, Silver Spring, Maryland.