1. Department of Physical Therapy, Faculty of Medicine, University of British Columbia, Vancouver, BC, Canada V6T 1Z3
2. School of Health, Care and Social Welfare, Mälardalen University, Sweden
3. Centre for Clinical Research in Sörmland, Sörmland County Council, 63188 Eskilstuna, Sweden
4. Department of Public Health and Caring Sciences, Uppsala University, 75122 Uppsala, Sweden
5. Department of Physiotherapy, School of Health, Care and Social Welfare, Mälardalen University, 721 23 Västerås, Sweden