1. Reference Center for Neuroradiology; University Hospital of Würzburg; Würzburg Germany
2. Department of Radiology; Pathology Research; Massachusetts General Hospital, Harvard Medical School; Boston Massachusetts
3. Department of Neuropathology; University of Bonn; Bonn Germany
4. Department of Pediatric Hematology and Oncology; University Medical Center Hamburg-Eppendorf; Hamburg Germany