1. Department of Neurology, Medical University of Vienna, Vienna, Austria
2. Department of Neurology, Clinic Landstrasse, Vienna Healthcare Group, Vienna, Austria
3. Department of Anaesthesiology and Intensive Care Medicine, Rostock University Medical Center, Rostock, Germany
4. Department of Neurology, Rostock University Medical Center, Rostock, Germany
5. Department of Neurology, Medical University of Vienna, Spitalgasse 23, Vienna 1090, Austria