1. Department of General Practice and Family Medicine; University Medical Center Goettingen; Germany
2. Department of Primary Medical Care; University Medical Center Hamburg-Eppendorf; Germany
3. Geriatric Clinic; University Hospital Zurich; Switzerland
4. Faculty V - Health, Religious Education; University of Applied Sciences and Arts, Social Affairs; Hannover Germany
5. Central Institute of Mental Health; Medical Faculty Mannheim/Heidelberg University; Germany