1 Department of Trauma Surgery, University Hospital Regensburg, Franz-Josef-Strauss-Allee 11, 93053 Regensburg, Germany. Electronic address: volker.alt@ukr.de.
2 Trauma Unit Department of Surgery, Erasmus MC, University Medical Center Rotterdam, Rotterdam, The Netherlands.
3 Orthopaedic Trauma Institute, Department of Orthopaedic Surgery, University of California, San Francisco, Zuckerberg San Francisco General Hospital, 2550 23rd Street, Building 9, 2nd Floor, San Francisco, CA 94110, USA.