1 Department of Neurosurgery, Medical Faculty, Heinrich-Heine University Düsseldorf, Moorenstraße 5, 40225, Düsseldorf, Germany. Franziska.staub-bartelt@med.uni-duesseldorf.de.
2 Department of Neurosurgery, Medical Faculty, Heinrich-Heine University Düsseldorf, Moorenstraße 5, 40225, Düsseldorf, Germany.
3 Department of Anesthesiology, Medical Faculty, Heinrich-Heine University Düsseldorf, Düsseldorf, Germany.