1. Department of Orthopedics and Orthopedic Surgery, General Hospital Oberndorf, Paracelsusstraße 37, Oberndorf, 5110 Salzburg, Austria
2. Section of Orthopedics, Department of Molecular Medicine and Surgery, Karolinska Institute, 17176 Stockholm, Sweden
3. Department of Orthopaedics, Karolinska University Hospital, 17176 Stockholm, Sweden