1. Department of Old Age Psychiatry and Psychotherapy; University Hospital of Psychiatry, Bern (UPD, Bern); Bern Switzerland
2. Graduate School for Health Science; University of Bern; Bern Switzerland
3. University Hospital for Psychiatry and Psychotherapy; University Hospital of Psychiatry, Bern (UPD, Bern); Bern Switzerland
4. Geriatric Research Institute; University of Ulm; Ulm Germany
5. AGAPLESION Bethesda Clinic Ulm; Geriatric Centre Ulm/Alb-Donau; Ulm Germany
6. Department of Epidemiology; Boston University School of Public Health; Boston USA
7. Institute for Evidence in Medicine; Medical Center - University of Freiburg, Faculty of Medicine, University of Freiburg; Freiburg Germany