1. Department of Neurosurgery; University Duisburg-Essen & University Hospital Essen; Essen Germany
2. Department of Anaesthesiology and Intensive Care Medicine; University Duisburg-Essen & University Hospital Essen; Essen Germany
3. Institute of Pathology & Neuropathology; University Duisburg-Essen & University Hospital Essen; Essen Germany
4. Institue of Pharmakogenetics; University Duisburg-Essen & University Hospital Essen; Essen Germany
5. Department of Anaesthesiology, Intensive Care Medicine and Pain Therapy; University Hospital Bochum; Bochum Germany