1. Department of Orthopaedics, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
2. Mölndal Hospital, Sahlgrenska University Hospital, Mölndal, Sweden
3. Harvard Medical School, Harvard University, Boston, Massachusetts, USA
4. Consultant Orthopaedic Surgeon, Sahlgrenska University Hospital, Mölndal, Sweden
5. Department of Orthopedics, Sahlgrenska University Hospital, Gothenburg, Sweden
6. Institute of Health and Care Sciences, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden