1. Department of Pediatrics and Adolescent Medicine, Ulm University Hospital, Ulm, Germany
2. Department of Nuclear Medicine, German Armed Forces Hospital of Ulm, Ulm, Germany
3. Laboratorio Analisi Sicilia, Catania, Lentini, Italy
4. Department of Neurosurgery, Ulm University Hospital, Ulm, Germany
5. Cancer Immunology and Immune Modulation, Boehringer Ingelheim Pharma GmbH & Co. KG, Germany
6. Department of Pathology and Cell Biology, Columbia University Medical Center, Albany, NY, USA