1. Department of Physiotherapy; Østfold Hospital Trust; Fredrikstad Norway
2. Department of Public Health and General Practice; Norwegian University of Science and Technology; Trondheim Norway
3. Department of Research; St. Olavs Hospital; Trondheim University Hospital; Trondheim Norway
4. Department of Surgery; Østfold Hospital Trust; Fredrikstad Norway
5. Centre of Biostatistics and Epidemiology; Oslo University Hospital; Oslo Norway
6. Department of Cancer Research and Molecular Medicine; Norwegian University of Science and Technology; Trondheim Norway
7. Department of Surgery; St. Olavs Hospital; Trondheim University Hospital; Trondheim Norway