1 Center for Orthopaedics, Trauma Surgery and Spinal Cord Injury, Trauma and Reconstructive Surgery, Heidelberg Trauma Research Group (HTRG), Heidelberg University Hospital, Schlierbacher Landstrasse 200a, 69118 Heidelberg, Germany; Raymond-Purves Bone and Joint Research Laboratories, Kolling Institute of Medical Research, Institute of Bone and Joint Research, University of Sydney, St Leonards, New South Wales, 2065, Australia. Electronic address: patrick.haubruck@med.uni-heidelberg.de.
2 Center for Orthopaedics, Trauma Surgery and Spinal Cord Injury, Trauma and Reconstructive Surgery, Heidelberg Trauma Research Group (HTRG), Heidelberg University Hospital, Schlierbacher Landstrasse 200a, 69118 Heidelberg, Germany; Bundeswehr Hospital Berlin, Department of Traumatology and Orthopaedics, Septic and Reconstructive Surgery, 10115 Berlin, Germany; Department of General Practice and Health Services Research, Heidelberg University Hospital, 69120 Heidelberg, Germany.