1. Centre for Elderly and Nursing Home Medicine, Department of Global Public Health and Primary Care, University of Bergen , Bergen, Hordaland , Norway
2. Complex Systems Laboratory, Department of Automatic Control and Systems Engineering, University Politehnica of Bucharest , Bucharest , Romania
3. Department of Biostatistics, Yale School of Public Health , New Haven, Connecticut , USA
4. Neuro-SysMed Center, Department of Global Public Health and Primary Care, University of Bergen , Bergen, Hordaland , Norway
5. Department of Health and Social Sciences, NORCE Norwegian Research Centre AS , Bergen, Hordaland , Norway
6. Haraldsplass Deaconess Hospital , Bergen , Norway
7. NKS Olaviken Gerontopsychiatric Hospital , Askøy , Norway