1. Public Health Promotion Unit, National Institute for Health and Welfare, Helsinki, Finland
2. Division of Clinical Geriatrics, Center for Alzheimer Research, NVS, Karolinska Institutet, Stockholm, Sweden
3. Department of Geriatrics, Karolinska University Hospital, Stockholm, Sweden
4. Neuroepidemiology and Ageing Research Unit, School of Public Health, Imperial College London, London, UK
5. Institute of Clinical Medicine, Neurology, University of Eastern Finland, Kuopio, Finland