1. Centre for Care Research, Western Norway University of Applied Sciences, Bergen, Norway
2. Department of Family Practice, Faculty of Medicine, The University of British Columbia, Vancouver, BC, Canada
3. School of Health Policy and Management, Faculty of Health, York University, Toronto, ON, Canada
4. Departments of Community Health Sciences and Emergency Medicine, Max Rady College of Medicine, Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, MB, Canada
5. Department of Gerontology, University of Vechta, Vechta, Germany
6. Department of Social & Behavioral Sciences, University of California, San Francisco, San Francisco, CA, USA