1. Department of Dental Materials and Biomaterials Research
2. RWTH Aachen University Hospital
3. 52074 Aachen
4. Germany
5. Neuroblastoma Laboratory
6. Interdisciplinary Center for Clinical Research
7. Istituto di Ricerca Pediatrica Fondazione Città della Speranza
8. Padova
9. Italy
10. Electron Microscopy Facility
11. Institute of Pathology