1. Department of Neurology; Otto-von-Guericke University; Leipziger Strasse 44 39120 Magdeburg Germany
2. German Center for Neurodegenerative Diseases within the Helmholtz Association; Magdeburg Germany
3. Clinic for Neurology; Hannover Medical School; Hannover Germany
4. Institute of Biometry and Medical Informatics; Otto-von-Guericke University; Magdeburg Germany