1. Department of Psychiatry and Psychotherapy, University Medical Center Goettingen, Goettingen, Germany;
2. Center for Health Economics Research Hannover (CHERH), Leibniz University Hannover, Hannover, Germany;
3. Department of Neurology, Philipps-University Marburg, Marburg, Germany;
4. Chair of Geriatrics, University Hospital Essen, Geriatric Centre Haus Berge, Contilia GmbH, Essen, Germany;
5. Department of General Practice, Philipps-University Marburg, Marburg, Germany;
6. Oberberg Clinics Berlin, Berlin, Germany;
7. Faculty of Medicine, Justus-Liebig-University Giessen, Giessen, Germany;
8. Practice for General Medicine, Wiesbaden, Germany;
9. Coordinating Center for Clinical Trials, Philipps-University Marburg, Marburg, Germany