1. Department of PediatricsUniversity of Colorado Anschutz Medical Campus Aurora CO 80045 USA
2. Department of NeurosurgeryUniversity of Colorado Denver Aurora CO 80045 USA
3. Morgan Adams Foundation Pediatric Brain Tumor Research Program, Children's Hospital Colorado Aurora CO 80045 USA
4. The Children's Hospital of Philadelphia and University of Pennsylvania PerelmanSchool of Medicine Philadelphia PA 19104 USA
5. Vall d'Hebron Institute of Oncology (VHIO)Cellex Centre Barcelona 08035 Spain
6. Institució Catalana de Recerca i Estudis Avançats (ICREA) Barcelona 08010 Spain
7. Department of Biochemistry and Molecular BiologyUniversitat Autònoma de Barcelona 08193 Bellaterra Spain