¹ Department of Anaesthesiology, University Hospital Aachen, RWTH Aachen University, Pauwelsstrasse 30, 52074 Aachen, Germany

² Department of Trauma and Orthopedic Surgery, University of Witten/Herdecke, Hospital Cologne Merheim, Ostmerheimerstrasse 200, 51109 Cologne, Germany

³ Faculty of Medicine in Hradec Králové, Department of Anaesthesiology and Intensive Care Medicine, University Hospital Hradec Králové, 50005 Hradec Králové, Czech Republic

⁴ Accident and Emergency Department, University of Leicester, Infirmary Square, Leicester LE1 5WW, UK

⁵ Department of Anaesthesia and Intensive Care, University of Paris XI, Faculté de Médecine Paris-Sud, 63 rue Gabriel Péri, 94276 Le Kremlin-Bicêtre, France

⁶ Department of Emergency and Critical Care Medicine, University Hospital Virgen de las Nieves, ctra de Jaén s/n, 18013 Granada, Spain

⁷ Guy's & St Thomas' Foundation Trust, Westminster Bridge Road, London, SE1 7EH, UK

⁸ Department of Traumatology, General and Teaching Hospital Celje, 3000 Celje, Slovenia

⁹ Shock and Trauma Center, S. Camillo Hospital, I-00152 Rome, Italy

¹⁰ Institute for Research in Operative Medicine (IFOM), Ostmerheimerstrasse 200, 51109 Cologne, Germany

¹¹ Department of Anaesthesia and Intensive Care, Université Paris Descartes, AP-HP Hopital Cochin, Paris, France

¹² Department of Surgery and Trauma, Karolinska University Hospital, 171 76 Solna, Sweden

¹³ Ludwig-Boltzmann-Institute for Experimental and Clinical Traumatology and Lorenz Boehler Trauma Center, Donaueschingenstrasse 13, 1200 Vienna, Austria

¹⁴ Department of Orthopaedic Surgery and Department of Neurosurgery, University of Colorado Denver School of Medicine, Denver Health Medical Center, 777 Bannock Street, Denver, CO 80204, USA

¹⁵ Department of Intensive Care, Erasme University Hospital, Université Libre de Bruxelles, Route de Lennik 808, 1070 Brussels, Belgium

¹⁶ Institute of Anesthesiology, University Hospital Zurich, 8091 Zurich, Switzerland