1. Department of Neurosurgery, University Hospital Dresden, Dresden, Germany.
2. Department of Anesthesiology and Intensive Care Medicine, Berufsgenossenschaftliches Universitaetsklinikum Bergmannsheil, Bochum, Germany.
3. Department of Trauma and Reconstructive Surgery, University Hospital Dresden, Dresden, Germany.
4. Department of Anesthesiology and Intensive Care Medicine, University Hospital Dresden, Dresden, Germany.
5. Department of Neuroradiology, University Hospital Dresden, Dresden, Germany.