1. Department of Children’s Orthopaedics , Aarhus University Hospital , Nørrebrogade 44, 8000 Aarhus C , Denmark
2. Orthopaedic Research Laboratory, Department of Orthopaedic Surgery , Aarhus University Hospital , Nørrebrogade 44, 8000 Aarhus C , Denmark
3. Danish Pain Research Center , Aarhus University Hospital , Nørrebrogade 44, 8000 Aarhus C , Denmark