1. Institute of Molecular Tumor Biology, Westfalian Wilhelms University; Muenster Germany
2. Department of Pediatric Hematology and Oncology; University Children's Hospital Muenster; Muenster Germany
3. Center for Neuropathology; Ludwig-Maximilians-University; Munich Germany
4. Clinical Cooperation Unit Neuropathology; German Cancer Research Center (DKFZ); Heidelberg Germany
5. Swabian Children's Cancer Center; Children's Hospital Augsburg; Germany
6. Department of Pediatric Hematology and Oncology, University Children's Hospital, Eberhard Karls University Tuebingen; Tuebingen Germany