1. Department of Neurology Medical University of Graz Graz Austria
2. Department of Anaesthesiology and Intensive Care Medicine Medical University of Graz Graz Austria
3. Department of Radiology Division of Neuroradiology, Vascular and Interventional Radiology Medical University of Graz Graz Austria
4. Institute for Medical Informatics, Statistics and Documentation Medical University of Graz Graz Austria