1. Department of Pathology, University Medical Center Utrecht , Utrecht , The Netherlands
2. Princess Máxima Center for Pediatric Oncology , Utrecht , The Netherlands
3. Department of Biochemistry and Molecular Biology, Sylvester Comprehensive Cancer Center, University of Miami, Miller School of Medicine , Miami, Florida , USA
4. Department of Neurological Surgery, Sylvester Comprehensive Cancer Center, University of Miami, Miller School of Medicine , Miami, Florida , USA
5. Department of Neurosurgery, University Medical Center Utrecht , Utrecht , The Netherlands
6. Department of Pathology, Amsterdam University Medical Centers/VUmc & Brain Tumor Center Amsterdam , Amsterdam , The Netherlands