1. Department of BioMedical Engineering, Steadman Philippon Research Institute, Vail, Colorado
2. Department of Orthopedic Surgery, Akershus University Hospital, Lørenskog, Norway
3. Oslo Sports Trauma Research Center, Oslo, Norway
4. Department of Orthopaedic Surgery, Oslo University Hospital and Faculty of Medicine, University of Oslo, Oslo, Norway
5. The Steadman Clinic, Vail, Colorado