1 Department of Pediatric and Adolescent Medicine, Pediatric Oncology, Hematology and Stem Cell Transplantation, University Medical Center Schleswig-Holstein Campus Kiel, Kiel, Germany.
2 Department of Radiology and Neuroradiology, Pediatric Radiology, University Medical Center Schleswig-Holstein Campus Kiel, Kiel, Germany.
3 Department of Pediatric Hematology and Oncology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.
4 Department of General, Visceral, Thoracic, Transplant and Pediatric Surgery, University Medical Center Schleswig-Holstein Campus Kiel, Kiel, Germany.
5 Department of Neurosurgery, University Medical Center Schleswig-Holstein Campus Kiel, Kiel, Germany.
6 Children's Cancer Center Hamburg, Research Insitute, Hamburg, Germany.
7 Institute of Neuropathology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.