1. Department of Neurology,
2. Department of Neurosurgery, Ernst‐Moritz‐Arndt‐University of Greifswald, Ellernholzstrasse 1–2, 17487 Greifswald, Germany,
3. Department of Anaesthesiology, University of Lübeck, Germany,
4. Department of Anaesthesiology and Intensive Care, Hospital Mannheim, University of Heidelberg, Germany