1 BG Klinikum Bergmannstrost Halle gGmbH, Department of Anesthesiology, Intensive Care, Emergency Medicine and Pain Therapy, and HEMS "Christoph 84" and "Christoph 85", DRF-Luftrettung, Halle (Saale), Germany.
2 Department of Anesthesiology and Intensive Care Medicine, and HEMS "Christoph 33" and "Christoph 71" Senftenberg, University Hospital Leipzig, Leipzig, Germany. manuelstruck@web.de.
3 Department of Anesthesiology, University Hospital Regensburg, Regensburg, Germany.
4 Department of Anesthesiology and Intensive Care Medicine, and HEMS "Christoph Rheinland", University Hospital Cologne, Cologne, Germany.
5 Danish Air Ambulance, Aarhus, Denmark.
6 Luxembourg Air Rescue A.s.b.l., Sandweiler, Luxembourg.
7 London's Air Ambulance, Barth's Health NHS Trust, London, UK.
8 Department of Anesthesiology, University Hospital Würzburg, Würzburg, Germany.
9 Emergency Department, University Hospital Düsseldorf, Düsseldorf, Germany.
10 Federal Armed Forces Hospital, Ulm, Department of Anesthesiology, Intensive Care Medicine, Emergency Medicine and Pain Therapy, and HEMS "Christoph 22" Ulm, Ulm, Germany.