1. Department of General Practice and Primary Health Care; University of Helsinki; Helsinki Finland
2. Unit of Primary Health Care; Helsinki University Central Hospital; Helsinki Finland
3. Institute of Health Sciences/Geriatrics; University of Oulu; Oulu Finland
4. Unit of General Practice; Oulu University Hospital; Oulu Finland
5. University of Helsinki and Helsinki University Central Hospital Clinics of General Internal Medicine and Geriatrics; Helsinki Finland
6. Clinics of General Internal Medicine and Geriatrics; Helsinki University Central Hospital; Helsinki Finland