1. Department of Neurodegenerative Diseases, Hertie Institute for Clinical Brain Research, Tübingen, Germany
2. Intergrated Care and Research Unit, German Center for Neurodegenerative Diseases (DZNE), Tübingen, Germany
3. Department of Neurology, Leun-Biskirchen, Germany
4. Department for Psychiatry and Psychotherapy, Center for Health Services Research in Medicine, University Clinic Erlangen, Tuebingen, Germany
5. Department of Neurology, Christian-Albrechts-University of Kiel, Tuebingen, Germany