1. Department of Health Sciences, Lund University, Lund, Sweden
2. Department of Educational Sciences and Psychology, University of Eastern Finland, Kuopio, Finland
3. Department of Social Sciences, University of Eastern Finland, Kuopio, Finland
4. School of Social Development and Public Policy, Fudan University, Shanghai, China
5. Department of Health and Social Management, University of Eastern Finland, Kuopio, Finland
6. Division of Ageing and Social Change, Linköping University, Linköping, Sweden
7. School of Computer and Information, Hefei University of Technology, Hefei, China