1 Department of Surgery, Trauma Unit, Academic Medical Centre, University of Amsterdam, P.O. Box 22660, 1100 DD, Amsterdam, The Netherlands.
2 Department of Orthopedic Surgery, OLVG, P.O. Box 95500, 1090 HM, Amsterdam, The Netherlands.
3 Department of Public Health, Erasmus MC, P.O. Box 2040, 3000 CA, Rotterdam, The Netherlands.
4 Department of Surgery, Trauma Unit, VU University Medical Centre, P.O. Box 7057, 1007 MB, Amsterdam, The Netherlands.
5 Department of Surgery, Flevo Hospital, P.O. Box 3005, 1300 EG, Almere, The Netherlands.
6 Department of Surgery, Deventer Hospital, P.O. Box 5001, 7400 GC, Deventer, The Netherlands.
7 Department of Surgery, Slotervaart Hospital, P.O. Box 90440, 1006 BK, Amsterdam, The Netherlands.
8 Department of Surgery, Haaglanden MC, P.O. Box 432, 2501 CK, The Hague, The Netherlands.
9 Department of Surgery, Noordwest Hospital Group, P.O. Box 501, 1815 JD, Alkmaar, The Netherlands.
10 Department of Orthopaedics and Traumatology, Helsinki University Hospital, Topeliuksenkatu 5, 00260, Helsinki, Finland.
11 Department of Surgery, Maasstad Hospital, P.O. Box 9100, 3007 AC, Rotterdam, The Netherlands.
12 Department of Surgery, Spaarne Hospital, P.O. Box 770, 2130 AT, Hoofddorp, The Netherlands.
13 Department of Surgery, BovenIJ Hospital, P.O. Box 37610, 1030 BD, Amsterdam, The Netherlands.
14 Department of Surgery, OLVG, P.O. Box 95500, 1090 HM, Amsterdam, The Netherlands.
15 Department of Surgery, Catharina Hospital, P.O. Box 1350, 5602 ZA, Eindhoven, The Netherlands.
16 Department of Surgery, Westfries Hospital, P.O. Box 600, 1620 AR, Hoorn, The Netherlands.
17 Department of Orthopaedics, Jeroen Bosch Hospital, P.O. Box 90153, 5200 ME, 's-Hertogenbosch, The Netherlands.
18 Department of Surgery, Trauma Unit, Academic Medical Centre, University of Amsterdam, P.O. Box 22660, 1100 DD, Amsterdam, The Netherlands. t.schepers@amc.nl.