1. Norwegian Institute of Public Health Postboks 4404 Nydalen Oslo N‐0403 Norway
2. Nordic Institute for Studies in Innovation, Research and Education (NIFU) P. O. Box 2815 Tøyen, 0608 Oslo Oslo N‐0302 Norway
3. Factor‐Inwentash Faculty of Social Work University of Toronto 246 Bloor Street W, Toronto, Ontario Toronto M5S 1V4 Canada
4. Norwegian Institute of Public Health Work Research Institute PO Box 4404 Nydalen Oslo N‐0403 Norway
5. Norwegian Institute of Public Health Postboks 4404 Nydalen Oslo N‐403 Norway