1. Department of Public Health and Caring Sciences, Uppsala University, Uppsala, Sweden
2. Department of Public Health and Caring Sciences, Disability and Habilitation, Uppsala University, Uppsala, Sweden
3. Center for Clinical Research Dalarna, Uppsala university, Uppsala, Sweden
4. State University of New York Downstate Medical Centre, Brooklyn, NY, USA
5. University Health Care Research Centre, Faculty of Medicine and Health, Örebro University, Örebro, Sweden