1. Orthopaedic Department Sørlandet Hospital Arendal Arendal Norway
2. Orthopaedic Surgery Clinic Oslo University Hospital Ullevål Oslo Norway
3. Oslo Sport Trauma Research Center Norwegian School of Sport Sciences Oslo Norway
4. Orthopeadic Division University of Oslo Oslo Norway
5. Orthopaedic Surgery Trondheim University Hospital Trondheim Norway
6. Norwegian Knee Ligament Register, Orthopaedic Surgery Haukeland University Hospital Bergen Norway
7. Occupational Medicine Haukeland University Hospital Bergen Norway
8. Orthopeadic Department Sørlandet Hospital Kristiansand Kristiansand Norway