1. Faculty of Health Sciences, Department of Physiotherapy, Oslo and Akershus University College of Applied Sciences, Norway
2. St Olav Hospital, Trondheim University Hospital, Norway
3. Department of Neuroscience, Norwegian University of Science and Technology, Norway
4. Health Services Research Centre, Akershus University Hospital, Norway
5. Institute of Clinical Medicine, Campus Ahus, University of Oslo, Norway
6. Department of Public Health and General Practice, Norwegian University of Science and Technology, Norway