1. Department of Pathology, University Medical Center Utrecht, Utrecht, The Netherlands
2. Institute of Clinical Pathology, University Medical Center Freiburg, Freiburg, Germany
3. Division of Pediatric Neurooncology, German Cancer Research Center (DKFZ) Heidelberg, Heidelberg, Germany
4. German Cancer Consortium (DKTK), Heidelberg, Germany
5. Hopp Children's Cancer Center at NCT Heidelberg (KiTZ), Heidelberg, Germany
6. Laboratory of Translational Immunology, University Medical Center Utrecht, Utrecht, The Netherlands