1. Department of Neurology and Danish Pain Research Center Aarhus University Hospital Aarhus Denmark
2. Department of Neurosurgery Aarhus University Hospital Aarhus Denmark
3. Department of Neurosurgery Odense University Hospital Odense Denmark
4. Department of Anesthesiology and Critical Care Odense University Hospital Odense Denmark
5. Department of Anesthesiology Aarhus University Hospital Aarhus Denmark