1. Department of Orthopaedics, Hospital NEO, Turku, Finland
2. Department of Surgery, Satakunta Central Hospital, Pori, Finland
3. Clinic of Orthopedics and Sports Orthopedics, Klinikum Rechts Der Isar, Technische Universität München, Munich, Germany
4. Department of Orthopaedic Surgery and Traumatology, University of Turku, Turku, Finland