1. Department of Health Economics and Health Services Research, Hamburg Center for Health Economics, Hamburg, Germany;
2. Department of Primary Medical Care, Center for Psychosocial Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany;
3. Institute of General Practice, Medical Faculty, University of Kiel, Kiel, Germany;
4. Central Institute of Mental Health, Mannheim, Germany;
5. Department for Neurodegenerative Diseases and Geriatric Psychiatry, University Hospital Bonn, Bonn, Germany;
6. DZNE, German Center for Neurodegenerative Diseases, Bonn, Germany;
7. Institute for General Practice, Hannover Medical School, Hannover, Germany;
8. Institute of Social Medicine, Occupational Health and Public Health, Medical Faculty, University of Leipzig, Leipzig, Germany