1. Department of Neurology & Stroke, Eberhard-Karls University of Tübingen, 72076 Tuebingen, Germany
2. Hertie Institute for Clinical Brain Research, Eberhard-Karls University of Tuebingen, 72076 Tuebingen, Germany
3. Department of Neurology, University Hospital of Larissa, Faculty of Medicine, School of Health Sciences, University of Thessaly, 41100 Larissa, Greece