1 Department of Orthopaedic Surgery, Kolding Hospital, Sygehusvej 20, 6000, Kolding, Denmark; Department of Public Health, University of Southern Denmark, J.B Winsløws Vej 9B, 5000, Odense, Denmark. Electronic address: cabrahamsen@health.sdu.dk.
2 Department of Public Health, University of Southern Denmark, J.B Winsløws Vej 9B, 5000, Odense, Denmark. Electronic address: binorgaard@health.sdu.dk.