1. Department of Neurosurgery, University of Ulm, Ulm, Germany,
2. Department of Neurosurgery, Krankenhaus Nordstadt, Hannover, Germany
3. Department of Pediatric Medicine, Clementine Hospital, Frankfurt am Main, Germany
4. Department of Pediatric Medicine, Intensive Care Unit, Medizinische Hochschule Hannover, Hannover, Germany
5. Department of Neurosurgery, University of Ulm, Ulm, Germany
6. Department of Neurosurgery, Medizinische Hochschule Hannover, Hannover, Germany