1. Department of Neurology, Philipps-University Marburg, Marburg, Germany
2. CogNet, Private Neurological Practice, Giessen, Germany
3. Department of General Practice/Family Medicine, Philipps-University Marburg, Marburg, Germany
4. Vitos-Clinic for Psychiatry and Psychotherapy, Marburg, Germany
5. Department of Psychiatry, Friedrich-Wilhelms-University of Bonn, Bonn, and German Center for Neurodegenerative Diseases (DZNE), Bonn, Germany