1. Department of Orthopaedic Surgery; Horsens Regional Hospital; Sundvej 30 Horsens 8700 Denmark
2. Orthopaedic Research Unit; Aarhus University Hospital; Aarhus Denmark
3. Department of Experimental medicine; University of Copenhagen; Denmark
4. Department of Veterinary Disease Biology; University of Copenhagen; Denmark
5. Department of Orthopaedic Surgery; Aarhus University Hospital; Aarhus Denmark
6. Department of Orthopaedic Surgery; Randers Regional Hospital; Randers Denmark