1. Department of Neuroepidemiology, Institute for Medical Informatics, Biometry and Epidemiology, Faculty of Medicine, University of Duisburg-Essen, Essen, Germany
2. Department of Neurology, Hannover Medical School, Hannover, Germany
3. Department of Epidemiology, School of Public Health, Boston University, Boston, MA, USA
4. Center for Clinical Trials Essen, University Hospital Essen, Essen, Germany
5. Department of Neurology, Vivantes Klinikum Neukölln, Berlin, Germany
6. Department of Neurology, BG Klinikum Unfallkrankenhaus Berlin, Berlin, Germany
7. Department of Neurology, University Medical Center of the Johannes Gutenberg University Mainz, Mainz, Germany
8. Department of Neurology, University of Lübeck, Lübeck, Germany
9. Department of Neurology and Stroke, University of Tübingen, Tübingen, Germany
10. Hertie Institute for Clinical Brain Research, University of Tübingen, Tübingen, Germany
11. Department of Neurology, University of Leipzig, Leipzig, Germany
12. Human Pharma Germany, Boehringer Ingelheim Pharma GmbH & Co. KG, Ingelheim, Germany
13. BDH-Klinik Elzach, Elzach, Germany