1. Department of Pediatric Hematology and Oncology; Justus Liebig University; Feulgenstraße 12 35392 Giessen
2. Children´s Hospital; Department of Pediatric Oncology and Hematology; University of Cologne; Kerpener Str. 62 50924 Cologne
3. Department of Neuroradiology; Justus Liebig University; Klinikstraße 33 35392 Giessen
4. Center of Nuclear medicine; Justus Liebig University; Klinikstraße 33 35392 Giessen