1. Department of Neurosurgery, Kantonsspital Aarau, Tellstrasse, Aarau,
2. Department of Neurosurgery, Neurocenter and Regenerative Neuroscience Cluster, Inselspital, Bern University Hospital, University of Bern, Freiburgstrasse, Bern,
3. Department of Anaesthesiology and Pain Medicine, Inselspital, Bern University Hospital, University of Bern, Freiburgstrassse, Switzerland.