[1] Orebro University Hospital,Division of Trauma and Emergency Surgery, Department of Surgery
[2] Orebro University,School of Medical Sciences
[3] University of Pennsylvania,Division of Traumatology, Surgical Critical Care and Emergency Surgery
[4] Penn Presbyterian Medical Center,Division of Neurosurgery, Department of Neurosurgery
[5] Orebro University Hospital,Clinical Epidemiology and Biostatistics, School of Medical Sciences
[6] Orebro University,Department of Surgery
[7] Karolinska University Hospital,Medical School
[8] Heinrich-Heine-University,undefined