1. Department of Orthopaedics, Sahlgrenska University Hospital/Mölndal, Sahlgrenska Academy, University of Gothenburg, Mölndal,
Sweden
2. Department of Research and Development, NU Hospital Group, Trollhättan/Uddevalla, Sweden
3. Department of Orthopaedics, NU Hospital Group, Trollhättan/Uddevalla, Sweden