1. General Practice and Primary Health Care, University of Helsinki and Helsinki University Hospital, Helsinki, Finland;
2. Primary Health Care Unit, Kuopio University Hospital, Kuopio, Finland;
3. Geriatrics, University of Helsinki and Helsinki University Hospital, Helsinki, Finland;
4. School of Medicine, University of Tampere, Tampere University Hospital, Tampere, Finland;
5. Gerontology Research Center, Universities of Jyväskylä and Tampere, Tampere, Finland;
6. Institute of Health Sciences/Geriatrics, University of Oulu, Oulu University Hospital, Oulu, Finland