1. Martina Hansens Hospital, Bærum
2. Institute of Surgical Research, Oslo University Hospital Rikshospitalet, Oslo
3. Oslo Sports Trauma Research Center, Norwegian School of Sport Sciences, Oslo
4. Orthopedic Center, Oslo University Hospital Ullevål, Oslo, and Faculty of Medicine, University of Oslo
5. Innlandet Hospital Lillehammer, Lillehammer
6. Division of Pathology, University of Oslo, and Oslo University Hospital Rikshospitalet, Oslo, Norway