1. Faculty of Education and Welfare Studies, Social Policy Unit, Åbo Akademi University, PB311 FI-65101, Vaasa, Finland
2. Department of Community Medicine and Rehabilitation, Geriatric Medicine, Sunderby Research Unit, Umeå University, 901 87 Umeå, Sweden
3. Faculty of Education and Welfare Studies, Demography Unit, Åbo Akademi University, PB 311 FI-65101, Vaasa, Finland
4. Department of Nursing, Umeå University, 901 87 Umeå, Sweden
5. Department of Community Medicine and Rehabilitation, Geriatric Medicine, Umeå University, 901 87 Umeå, Sweden