1. Department of Anesthesia, Section of Neuroanesthesia, Aarhus University Hospital, Aarhus, Denmark
2. Department of Neurology, Heidelberg University Hospital, Heidelberg, Germany
3. Department of Anesthesiology and Intensive Care Medicine, Sahlgrenska Academy, University of Gothenburg, Sahlgrenska University Hospital, Gothenburg, Sweden
4. Danish Center for Clinical Health Services Research, Department of Clinical Medicine, Aalborg University Hospital, Aalborg, Denmark
5. Department of Anesthesiology and Intensive Care Medicine, Regional Hospital in Horsens, Horsens, Denmark
6. Department of Neuroradiology, Aarhus University Hospital, Aarhus, Denmark
7. Institute of Medical Biometry and Informatics, University of Heidelberg, Heidelberg, Germany
8. Department of Radiology, Sahlgrenska Academy, University of Gothenburg, Sahlgrenska University Hospital, Gothenburg, Sweden
9. Department of Neurology, Klinikum Kassel, Kassel, Germany
10. Department of Neurology, Aarhus University Hospital, Aarhus, Denmark