1. Department of Pediatrics and Adolescent Medicine, University Medical Center Ulm, D-89075 Ulm, Germany
2. Department of Neurosurgery, University Medical Center Ulm, D-89075 Ulm, Germany
3. Department of Pathology and Cell Biology, Columbia University Medical Center, New York, NY 10032, USA
4. Department of Clinical Chemistry, University Medical Center Ulm, D-89075 Ulm, Germany
5. Department of Radiology, German Armed Forces Hospital of Ulm, D-89081 Ulm, Germany